AIBU to keep my Monday off rather than swap for a new parent?

[Orangeducks]

I have 3 children 10, 8 and 4. When my eldest was born, I reduced my hours at work to 4 days which worked well. Several other parents have done the same. My colleague is returning to work from mat leave and has been offered a day off but its a Wednesday as they can't cover any other day (customer facing) and she was complaining how other members of staff have had the more desirable Mon/Fri off for many years and they should give that up for new parents. She wasn't talking directly to me but I felt she was annoyed I wouldn't give up my Monday off because my children are 'grown up'. I feel that I have built my life around a Monday off and have so much going on in the week running around after my kids that I still need it. Moreover I have no plans to return to full time as I enjoy the work/life balance and we make financial sacrifices to allow this and I am on a permanent 4 day contract.
Am I being unreasonable to not give up my day for her?

I bet she was one of those people who moaned about parents having to take time off for children's sickness and booking holidays in school.holiday time.
It's all different now she has her own child and obviously she is the only one to have given birth!.
No dont give her anything. I bet she wouldn't change her days for anyone.

I did the same thing. I really loved my mid-week day off with dd.

cant see what difference it makes. Kids are in school or nursery Mon-Fri so any of those 5 days off should help her

If anything you need the Monday off more than her as you have 3 kids and will have things to catch up with after the weekend. If there’s only a Wednesday available to her that’s what she will have to accept. I’ve recently changed my day off from a Monday to a Thursday and I’m regretting it already as I look after my grandchildren at the weekends, at my age I could do with the Monday to recharge my batteries rather than getting up early to go to work !

Not unreasonable, you were just lucky colleagues hadn't taken all the Mondays when you wanted a day off. A Wednesday isn't a great a day off we can all acknowledge that.

In her eyes your kids are grown up. Little does she know how much hardening logistics and time it will be as they get older and are in the school system with school holidays. Activities, etc etc etc! A Wednesday off with a baby / toddler age is quite nice, I did it. The downside is if she travels to visit family as she loses out on a slightly longer weekend. But that isn’t your issue. If you’re challenged by your boss just say you have your schedule confirmed around a Monday off for the year ahead

There's no reason for you to feel guilty or pressured into giving up your non-working day, whatever day of the week it is. You've structured your family life around your NWD and that's that. She'll have to wait until a Mon or Fri comes up IE if someone leaves or wants to change their NWD.

No-one should be obliged to change their work pattern based on someone else's choices regarding family, and I include new and existing parents in that

Hey, what do you mean? OP still gets bank hols as these have to be taken on a non-day off (she will just book it another day). If her contracts states she has bank hols off, she still gets them.

You can't take hol on a day off so it gets pushed to another day. Or did you mean something else?