ExH put new wife on kids pickup list

[Fatmum21]

AIBU? Name changed for this.
Me and ExH have been divorced for four years with DS 15, DD 11, and DS 8. It was a messy divorce for reasons I won’t get into now.
ExH new gf, is is 9 years younger and they have DC three nights a weeks. They have been together for 18 months and she isn’t my biggest fan but we are civil. I recently found out that ExH has put her on the pickup list for my, DD and youngest DS who are both in primary school. ExH did NOT tell me this and I have found out through DD! I confronted ExH and he said it wasn’t a big deal! AIBU that he didn’t tell me about this, or should I ‘relax’ (ExH words)

[quote user1498572889]@AlDanvers
As I said in my first post I just think it is the polite thing to do.[/quote]
But that's my point. No one can say why its polite. It's doesn't impact the op at all, in the slightest. This woman already spends 3 nights a week with them.

They’re his kids too, you sound a little bit controlling.

@Whatsonmymindgrapes

What’s the issue? Why doesn’t she like you?

I can't possibly imagine