HELP already passed Breaking Point Last Hope

I am a mother of three beautiful girls and recently we lost our home. My father their grandfather sold it out from under us we were paying him $350 a month rent until the balance on the trailer was paid off I got it down to 8000 and he sold it to one of my ex-boyfriends. So now we are staying at my mother's house and it's hell. My mentally retarded nephew thanks that he runs the house and long story short He is wanting his room back so mine and my children's only option is to stay in an old camper that has two windows busted out and it's full of mold I have no other family nowhere to go and no money so I am begging for help to get me and my girls out of this God awful situation and into a better one before something bad happens and it's only a matter of time before it does