Why is it always assumed that grandmothers/MILs will help with childcare, whether it is school runs, babysitting, or full days looking after toddlers, while grandfathers are basically off the hook? No one expects grandad to drop everything to help out or be available at short notice. He is retired, has his hobbies, or is too tired. Meanwhile, granny’s time is apparently just there for the taking.
It feels like the unpaid labour of childcare is simply being passed on to the older generation of women, while the men are still largely left out of it. Let's be honest, a lot of FILs are not expected to be hands-on grandparents and no one bats an eyelid. But grandmothers get guilt-tripped if they are not always available.
Obviously I am sure there are lots of FILs and grandfathers who do their fair share and more. This is more about the general expectation and double standard.