Our daughter goes to PIL a few times a month for afternoons when both my partner and I are working. DD is just turned 2 and is genuinely angelic for PIL.
PIL never take DD out of the house despite having her for 6+ hours at a time. We leave her car seat but she ends up just staying indoors at theirs the entire day. There is a very quiet toddler group that DD attends every week less than a mile up the road from theirs that I suggested they could go to last week, but they didn't. They don't take her to any activities which is fine as I appreciate there could be an anticipation of things being a bit chaotic at soft plays, etc, but they don't even take her to the park or for a walk (we live in a part of the country with lots of local walking routes). They aren't elderly or frail, in fact MIL used to be a primary school teacher so she's very much used to young children.
I appreciate them having her and they don't just do it to help us out, it's very important to them that they get to spend time with her after limited contact with other grandchildren. I just find it a bit sad for DD that days she goes there, she's pretty much confined to their lounge despite being a very high energy toddler who loves anything physical.
AIBU to think it's odd that they won't take her out anywhere?