DP has an adult daughter, we have two young DC's.
DP's daughter has about 10 pets, a mixture of cats, dogs, rabbits as well as fish. Issue is she is frequently going away and expecting (well demanding) DH looks after them for her.
Her house is about 20 minutes away from ours, so it's 40 minutes worth of driving plus the time it takes to walk dogs, clean litter trays, feed them all etc. So in total he ends up being away for near 2 hours, at least twice a day. This aside him working full time means I end up with having virtually no help with kids/house.
Other thing is she never leaves any food or general resources to look after them (cat litter etc) meaning DH has to buy this which as pet owners will know, ends up costing a fair amount for so many animals. Money we don't always have.
Now if this was once/twice a year it wouldn't be an issue at all but its practically every other month for at minimum week at a time, as well as all the odd days here and there which she goes to her BFs and doesn't return so he is sent to see to pets (he drives, she doesn't). Again this happens often.
AIBU to think he should tell her no sometimes? As I said she doesn't ask, she demands, and anytime he doesn't give into her she can be very manipulative. So she says jump and he says how high, to keep the peace. I just don't think it's fair when it so regularly interrupts other parts of his life (which she is well aware of).