Do you think my kids are stressed?

I was just wondering if this is normal children behavior or could it be stress? My two kids and I live with my parents. The house is not that big. The bedroom we sleep in (my old bedroom), has there bunkbed, twin bed for me to sleep on, two chester drawers, a tv on top of one chester drawer and a bathroom. I feel cramped up inside that house. We need our own place but cannot afford it since I filed for bankruptcy two years ago. I love my parents , but we have no privacy, only when they go to town or something. My 8yr old boy is a momma' boy. I am not saying he relys on me all the time he can be independent at times and go play with the neighbors kids and spends the night with his daddy every other weekend. But sometimes he just has to be right there with me. He can be stubborn at times and won't mind. When I do him he hits on arm , I him on the arm or try to on the and he does it again. My little girl is not like that. Sometimes he will call me hateful and I have been know to say that to him, and have apologized for it to. I told him I will try not to say it again. My dad has to go outside because he cannot take the loud noise. I have a tendency to get loud sometimes and have a temper and I am not proud of it. I take it after my father and his side of the family. It doesn't happen too often, and wished it didn't happen at all. Sometimes my dad will try to discipline my kids when I am in sight. If they are doing something they do not need to do, he will get on to them when I am standing right there. I feel like I need to get on to them , not him , when I am around. If I am out of sight or in town or something he can discipline them of course. It is hard to talk to him at times about this stuff because he thinks I have an attitude about it when I do say stuff, which I don't. Or if my kids want to go over at a friends house (two houses down from us, my dad will say no right in front of me. I am thinking, I thought I was the parent here.They only go over there in daylight and come back when it is just starting to get dark. Also if they have gotten there homework up. My dad doesn't like it when they come home in the dark, afraid they might get run over or kidnapped. I feel the same way to. Well anyway I think I have written enough. Any advice on what to do? Bad parenting skills, too much stress in the house, living situation, what? I feel like we could do so much better on our own and have less stress.All comments welcome, just don't be too harsh.