Dogs don't want to be inside?

Okay so my dogs are outside dogs but they have jumped the fence a couple of years ago and people thought they were fighting dogs so they were stolen and returned injured . All that happened years ago. I would estimate we had these dogs for 5 years and have had them since they were puppies. So they are pretty old but are rebels.lol Anyhow because of the said issues in the past they are allowed in the backyard and at night because it gets cold here. So they boy dog has always been the runt of the litter and the sister was always the boss. Now my brother who takes care of the dogs has left(he leaves every weekend) and the dogs are bad but usually goes inside without being bratty but lately they put up a fight(not physically) just to come in. Tonight the boy dog has seemed the most stubborn which is out of character since he acts like a puppy afraid of his older sister. They sleep in one of those bed like things that closes but you can still see them, there is plenty of room and all. so they can undue the bottom latch which is weird, I have tried paint buckets(closed of course),a vacuum,etc to block the door but it won't work ;/ anyhow it took about an hour all together to get them inside,and they are eyeing the door every few seconds. Also my dogs are not aggresive but the boy dog was baring his teeth(more of a smile) and they were wagging their tails. They are waiting for the moment(i am across from them) that I let my guard down. Please help, they are going outside in the morning at 8 or 9. Please note they are medium size dogs, they don't bite but they have their moment. Please help me my brother is coming home at like 10 pm it's 1 in the morning and I am watching them because my mom is taking care of my 2 year old brother. Please note I am 12 and a half and they can overpower me(not aggressively) and they are heavy, don't worry I won't hit lol I just need help-if I let outside they will bark and paw at the door but I'm sure you know they won't go to sleep or anythig. Thnx and sorry for my writing