Ex and family stayed with BF for Christmas.?

Your directing your issue at the wrong people. These people have stayed in your BF life, because HE allows it. He may just be thinking of the kids, and putting his personal feelings aside for them, but sometimes some are too nice, and this seems the case here. Unfortunately these are all issues which should have been spoken about between you two, before establishing a boyfriend, girlfriend relationship. If you feel you should call it quits that is all fine and good, but learn from this. Remember the next time you meet someone who has kids, is most likely going to have some sort of luggage, so it depends on how serious you are about a particular person.