FiL (and so MiL as well) have Liebling sometimes for us. Good side is relationship with grandparents. Bad side is backup for holidays/sickness. Or MiL changing her mind about things.

PiL are pretty fabulous with Liebling. They are both retired and love having him around. They don't do things the same as me, but I don't have a problem with what they do. They also have him some evenings for me, usually when DH and I both have to work in the evening, which a normal centre won't do.

If PiL were to be Liebling's only carers, I'd consider having us all live together as a big family unit. That way everything would be consistant and illness wouldn't matter so much: they're still technically on-hand if needed. Just having a snuggly TV day.