Children spending day with ex's partner

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So my 3 youngest are having an extra overnight with their dad next Tuesday evening who will be working on Wednesday. His partner is going to spend the day with the kids and take them out for the day as there is a school in service day. I do know how I feel about this aibu? Would you allow this ?

She has no kids of her own.

I think it’s unfair that she gets to have fun with them on one of your days and then presumably she and ex get to have fun with them on the weekend. I think you need to renegotiate access.

I think it’s unfair that she gets to have fun with them on one of your days and then presumably she and ex get to have fun with them on the weekend. I think you need to renegotiate access.

How is it unfair though? It sounds like typically the kids only see them EOWE. Surely it's fairer they get to see their Dad and stepmum for an extra night / day since they spend relatively little time there?

Every other weekend access is a joke, if I were your ex id be pushing to increase that massively.

Shark it was all he wanted unfortunately