Ahh, one of the trickiest Omo questions of all time. And one I know all too well. Let me give you the bad news first:
The Bad News: As long as you live at home... with your parents... under their roof, you will not be able to indulge with the same freedom and abandon as those of us with our own living spaces. It's just that simple. There will always be the chance they could walk in (or barge in with entitlement) on you in your most vulnerable moments, exposing your deepest darkest secret. Or find your stash of wet clothes, diapers, etc while cleaning your room. Or whatever. Therefore you must take certain precautions if you want to enjoy this pastime in a discreet & dignified manner.
The Good News: With some careful planning and observation, you CAN enjoy pants wetting while living with your parents or any other roommate provided you're willing to consistently take the right precautions to protect your privacy.
If stealth isn't an issue or you WANT to get caught , then skip this article. It's written specifically for people with little privacy who can't afford to get busted.
Disclaimer
First things first, you must put your safety and best interests ahead of this fetish. That means if you're likely to get kicked out and become homeless or incur violent attacks, damage to your reputation or other serious consequences if caught, you should abstain & wait until you're out of your current living situation. In the meantime, work toward getting out of whatever Hell you're living in because you don't deserve to live with people who would do that to you regardless of the reason (let alone for the way you choose to express your sexuality which is a private matter). Only you know whether your roommates are prone to wild temper tantrums/outbursts of anger and are likely to ruin your life over this. Most of us would be mortified to be "found out" but that's not the same as being actively endangered by tyrannical parents, etc.
But if your parents or roommates are more laid back and you're prepared to handle any humiliation or awkwardness that comes your way in a worst-case scenario, it's probably safe to proceed cautiously. Not necessarily good judgment, but safe nonetheless.
ALWAYS think in terms of worst-case scenarios when engaging in this "hobby". Ask yourself questions like: "What if I'm caught? What will I say I'm doing? Why could my pants be wet other than peeing them for pleasure?" That kind of thing. Have a Plan A, B and Z lined up just in case. We'll get into the logistics of it all in a minute but it's vital to consider where you could go in the event you get caught and it became too contentious at your house for a while. I say this as someone who got in serious trouble and endured verbal abuse when I was caught as a teen.
Timing
While the urge to wet your pants and engage in other forms of pee play can wax & wane at random times, you'll have to schedule your actual playtimes carefully while living with roommates and especially parents/family. Pay attention to their schedules: what days are they usually gone the most? Do they ever go out of town for vacations, holidays, etc? Check their calendar and try to plan so it matches up with your planned wettings as much as possible if you're going to wet in the house, that way you won't have to worry about them barging in on you which takes away all the fun even if they don't. Make sure your phone notification sounds are on so they can call you if plans change & they decide to come home early, and encourage them to inform you of plan changes as much as possible, as they'd want you to do the same. (However don't harp on this or you risk sounding suspicious).
Always leave time after your fun for proper cleanup. This includes things like doing laundry, mopping the floor, washing/hiding your pee mats, hiding diapers & clearing the search history on any shared devices. Speaking of laundry, you should be doing your own whether you live alone or with your parents, as this will be an important life skill at some point AND it allows you much more privacy when it comes to pant-pissing. Plus, the more you clean your own room, the less your mom will be making unnannounced swoops through it to clean it while you're not there. If she still doesn't get the message, tell her (or your dad) that you have trouble finding your essential items after they clean your room & request permission to do it yourself. And then DO it.
Place
If your parents are like mine and NEVER FUCKING LEAVE THE HOUSE, that doesn't mean you can't have a little fun now and then. You just have to get a bit creative with the setting. In general, the bathroom (tub/shower, sink, toilet) are safe places to wet yourself as most bathrooms have locks on the door and you can pretend to be in there bathing or doing some other private hygiene task for a while without it seeming odd. Just don't stay in there for 5 hours or go to the bathroom 100 times a day. You can sneak your wet clothes out under a bath towel or smuggle them out with your dry stuff.
After everyone goes to bed for the night, you can hide under your covers and let loose if you have your own bed or bedroom. A quality incontinence mat will allow you to piss the bed without ruining your mattress, though it'll need to be laundered ASAP the following day to prevent the smell from setting in. The PharMeDoc is a great and affordable choice, and I've seen rave reviews about the PeaPod brand as well. This is also where diapers can come in REAL handy.
If you don't have your own bed or bedroom, you can sneak back to the bathroom and spurt into the tub or toilet again through your jammies. Just be extremely quiet & make sure to light your way properly. The last thing you need is to trip and break a bone in service of your fetish.
Got a big backyard or some open farmland/acreage to play with? This makes for the perfect semi-private pissing locale in the warm and cool months. Just slap on some dark Spandex/polyester pants or a nice short flowy skirt over some cotton panties and leak to your heart's content. You can pretend to be tending to a garden, taking pics for social media, birdwatching, kicking a hackey sack around.... just make sure you change out of your wet pants ASAP once you re-enter the house and hide them somewhere good until you can wash them. AND DON'T FORGET TO WASH THEM! (I made that mistake and hoo boy did I ever regret it. It's how I was ultimately busted).
If you have a car or live near scenic outdoor locations, you may even be able to work wetting into some away-from-home outings if you plan ahead. Bike-riding, hunting or fishing, hiking in the woods, concerts & festivals, trips to bodies of water like lakes/ponds/oceans/pools & many other outdoor activities can all be done with wet patches on your pants. You just have to wear the right stealthy clothing. If you have a habit of getting too desperate or enjoy having a spurt in your car, always carry an extra towel in the backseat. That way if you wet your car seat it will be somewhat protected. A giant trash bag serves the same purpose. Keeping a pair of dry pants in your trunk is just good practice for anyone who engages in bladder holding or has legit accidents for any reason.
Clothing
I did a whole in-depth review of clothing materials, colors & fits so you can see for yourself which ones hide urine spots the best. Thankfully some of the cheapest materials work best for hiding pee accidents, and there are other things you can do to minimize the (obvious) damage, such as hydrating yourself properly with plain water & peeing on the move to avoid making one big puddle in one place. TL;DR - if you choose the right material, you can hide your wetness even AS you're peeing.
What NOT to DO
There are some places you should never, ever pee whether you live alone or with others (but especially with others). Any large or immovable item that can't fit in the washing machine such as couch cushions, carpet, car seats or floorboards, recliners, mattresses or pillows that say DO NOT WASH should stay far away from your pee hole. Letting pissy clothes ferment longer than 12-24 hours is extremely ill-advised as the smell is both strong and instantly recognizable. You can't blame it on "the dog" or cover it up with some air freshener. I recently did an article about clean-up so definitely check that out. Some products like Febreze or Ona Pro Gel can help neutralize odors, but don't rely solely on them or you'll likely get busted. Human urine is one of those scents that's detectable to most at very low concentrations.
Yes, I know all this detailed planning kills the spontaneity to a degree but that's the price you pay to live under someone else's roof. It just makes having your own space all the more amazing when you finally get it. Being able to wet myself any time in any room of my apartment has been hands down the best part of living solo. There's truly nothing like doing chores as hot urine drips down your thigh or hanging your ass off the sofa and wetting your panties onto the hardwood floor with abandon. 🫠
So to answer the original question: the best way to wet your pants without your parents knowing is to move out of their house. The 2nd best way is through careful planning in regards to timing, setting, clothing fabric & cleanup.
Have a believable explanation for your wet pants at all times.
Plan ahead, check schedules & clean up after yourself immediately if possible.
Do your own laundry & keep your room clean so parents have less reason to enter.
Invest in a washable incontinence mat or mattress protector.
Always keep a dry pair of pants, wet wipes & a thick towel or two in the car if you drive.
Choose your clothing materials carefully if you'll be wetting around roommates/family.
Only pee on things that can be laundered; no carpet, mattresses, furniture or car seats/flooring.