AITAH for not letting people take left overs home?

My my fiancée (48m) and I (37f) have been together roughly 3 years and just had a baby about 5 months ago. He has 2 kids (13m and 21m) from two past relationships.

We have his older kids over a couple of times a month for dinner ( a little less since the new baby because he is a very demanding baby). The older kids had always asked for leftovers, which I find rude to ask for food to bring home but that’s just how I was brought up. I would oblige and send them with to go containers until the middle kid asked for leftovers for his mom (who has disrespected and crossed boundaries in my relationship in the past and continues to do so). She had even called to follow up to make sure he had leftovers for her. I did not give the left overs and since then every time he asks I say no and come up with some excuse.

I spoke to their father about the situation and that I felt uncomfortable and I don’t want to be feeding the other kids mothers since they have been nothing but a nuisance and went off the deep end when my pregnancy was revealed. He said that she was just kidding from what he understood, she absolutely was not. He doesn’t step in when they ask for leftovers and just lets me sit there and squirm to come up with an excuse.

A couple of extra details, I am on maternity leave and keeping my family afloat because my fiancée has been unemployed for the majority of our relationship. He continues to allow a disrespectful relationship with one of the older kids mothers despite my constant frustration. The left overs are nice to have so I don’t have to cook for a couple of days and can focus on my baby and also the meals are expensive. AITAH for not giving leftovers to the kids because it will go to their mothers?