When people say my son is my boyfriends first baby it really upsets me. really we don't have a 3 and…

When people say my son is my boyfriends first baby it really upsets me. really we don't have a 3 and half year old? he claims her and he's been around since I was 4 months preg and he's the only dad she knows... y say it... and when he corrects them they will start say yea but this one is really urs what the heck people