Am I being unreasonable?

[Woznian1992]

I was wondering if you lovely ladies could help me, to cut a long story short I have a 5 month old baby, I am no longer with his dad. We are having my son christened in a few months (I have made all the arrangements) and I have asked for his guest list for invites, well it came out 10 days after my son was born that he was in a sort of relationship with someone new both behind my back and her husbands however he says that they are just ‘good friends’🙈 as you can imagine things have been a bit rocky since finding out anyway back to the guest list he sent me his list through and it had her name and her children’s name on there, I catagorically told him that she wasn’t welcome nor would she ever be welcome at anything we do for my son. So he’s sent me his new guest list through and he has taken her name off but left her children’s name on there, I’m in no way blaming the children or hold any resentment towards them however I don’t want them to come to my sons christening quite bluntly they aren’t anything to my son at all and I don’t fell like I should have to accommodate them, am I being unreasonable to tell him the children aren’t welcome? I just feel that given the situation and the things that they have both done he shouldn’t even expect me to have her or her children at my child’s christening? Help!!
Thank you

I think she meant he’s her sons father? Not the girls father.

They’re your ex’s kids?

So he’s having an affair with the mother of his kids who’s married to someone else now?

If they’re his children then I think it’s normal to invite them.

So these are his children and you were the OW?

So they had kids together.
Split.
She married someone else.
They are now having an affair.

If this is the case they are his kids so ypur son's half siblings so it is reasonable for him to expect them to be there. They will ne your child's brother/sister.

If I have misunderstood and they are not his children then no need to but if they are do not exclude them from an important event in their brother's life.

The two children aged 7 and 3 are her children, not my ex partners children.

My ex partners ‘good friend’ is his sister in laws sister, so they are the nieces to my ex partners sister in law and brother.

Then no they don't have to be there.

Are you sending the invitations out? Just leave them off.

Are you sure that they are not his children?

Can anyone else sense a Jeremy Kyle show in the making?

Is he paying for half the party afterwards? If not, invite your child's aunts and uncles on bith sides and just your friends.
DO NOT invite her kids because I have no doubt she would attend too.
I would go so far as to tell your ex that if they arrive you will tell everyone what 'close friends' thry are.