How can I stop my mom's dogs from peeing inside.?

Go to your local pet store and buy 2 things. There are wee-wee pads (if you cant put them outside), and a spray that will encourage them to go in a certain place. It has a special scent. You can use that Spray indoors and outdoors. You could also get a gate to block off your space, just in case the dogs have an accident, it wont be in your room.