How should I be feeling about my new step-son?

It is noral because you care about him a lot, and meaby his mom is not the best mom.

But it IS his mom, and no matter what it seems that his mom loves him, is just that she is not in the best conditions, he loves him mom too it looks like. I think that you should be calm, because if your step-son would not like to go he would have said so. But they also need to have bondage or something so your step-son dosen’t feel bad or nothing too.

It is normal as you care about him which is good. You need to let him stay with her when he wants as she is his mother and however irresponsible she is, he most probably loves her and she most probably loves him. Maybe you could encourage her to be a better mother for example you could all go out for dinner. You, your fiance, his son, the mother, and the mothers mother and anybody else involved. You would all be able to talk as adults and the boy would see his family all in a group having a nice time. It will be good for him.

If dinner is too formal, then a movie would be good, or even just a barbecue at your house or lunch one Sunday afternoon. It will be good for all of you to interact on a single level, without you worrying about the boy’s safety.