hello!

i have a nine year old son, who lost his birth father. i married a man with a daughter whose mother lives in florida so we have her most of the time. my son is nine and his daughter is eleven. heres the probelm, my son is both physically and mentally abusive to me. for example. the other day i asked him to put his shoes in his room, he told me i was a fatso and i sagged, of which is not true. i told him that was not nice and to not talk to me like that again, so he proceeded to hit me and throw his shoes at me. i toled my husband about it and he told my son to go to his room that i had an anger problem. i was really hurt and mortified that he seen nothing wrong with his behavior and something wrong with me asking him to pick up his shoes. my son has lead to me to want to die and commmit sucicede. his behavior towards me had made me want to die. his daughter on the othe hand behaves real good when hes around, the instant hes not she is really bad. she gives me dirty looks, talks to me like i am scum under her feet, and is really mouthy. the other day (we have a small house) her and my son weere in the kitchen, my husband in the bathroo with the door shut, me in the bedroom relaxing and reading a book and bothering no-one. i heard her tell my son to come into my bedroom and shake his penis at me and if he didnt she would beat him up. he procedded tp do so, i told him to go to his room, then i told her to take her nasty ass to her room. i told there dad when he came out and he said i was lying that his daughter would not do a thing like that. my son came into the bedroom and even told my husbvand that it was true and that his daughter had said she would kick hi ass if he didnt do it. he still didt beleive us. i am at my witts end and ready to die. why are chldren so nasty and disprespectful to a parent and the other parent allows it?