Well my mom has a boyfriend and I don't like him ?

he treats us way different when she is not here but when she is here he acts lke prince. He is always blaming my little sister kaitlin for everything. He yells at the stupiid little things like my dad did but my mom still loves him. Ever since he moved in with her she doesn't pay attention to us. When I ask her something and she is with him she says “go ask your sister” and I'm fed up with it.