2blessed try and use family changing with a change table if you can. Otherwise use a travel change mat or extra towel to lie them on the floor while you change. If you're doing that, get them into their swim stuff first, and change them last on the way out. Then it doesn't matter if they wriggle and roll onto a wet floor.
Watch for them getting cold. Probably half an hour max at this age.
Wrt MIL, it really doesn't help that tomorrow is the 6th anniversary of FIL death. So she's a bit raw and on edge. She has had DD most weeks since the new year, but for a short day and not with A.
It's just a perfect storm of toddler dropping her nap, and having lots of change in her life. I had lots of questions this morning about where I was going and where she was going and where A was going. So hopefully it will get better quickly.
We've thought of some options anyway, so I'm feeling a bit better.
FoD make the most of having them around. Let them look after the baby while you get things sorted if you need to. Or go out. Every day, all day.
Day 2 at work and still no meeting with boss or anything to do.