Not sure...just think you need to talk. Preferably your partner should as they’re his parents.
I personally don’t do overnights. I’ve done my time, and don’t want it again. Always happy to do days though if I can.
However, your MIL has done overnights with her granddaughter, so it’s not unreasonable to ask her to explain if she can. It may simply be she’s used to one child, but doesn’t want to expand on it.
Congratulations on the baby, and hope all goes well. Remember...none of this is important, just your lives together with your children.
Should women have equal pay and opportunities?
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To think that London, or anywhere else for that matter, does not belong to any one demographic