So I've been with my partner for 7 years we have just had a baby together. We finally moved in together 2 years ago We never really argued up until the last year. I have my 9yr old daughter from a previous relationship he has a son and a daughter same age as mine. The problem is I find my stepchildren really rude they have zero manners and look at me like I'm a piece of rubbish they stood in, I get yes no answers 9/10 or if they don't feel like answering me they just stare at me like they are looking through me, I can't have a conversation with them my stepson I can understand as he's a teenager they just want to be left alone, but my stepdaughter is really hard work she acts like a different child around her dad and family it's like she reverts back to a baby, if anything happens in the house my daughter gets the blame for it it's only once my child's been punished my step daughter will own upto it. We have spoke with all the children and asked why they ignore me or stare at me and they simply say don't know, this is causing arguments with me and my partner because I find myself not wanting to be around when we have them round. What am I doing wrong or what else can I try. I've taken them on day trips just the 3 of us but nothing I do seems to work.