Im lucky i guess, both Mum and MIL don't mind animals in the house as they have always had indoor animals anyway. Bit bizarre as Mum is a huge clean/neat freak but she still doesn't mind the animals indoor, just means the vacuum cleaner is on nearly 24/7 LOL
The rest of my family wouldn't find animals inside idyllic - they also have the clean freak gene especially my grandparents who i love and adore (i call them mum & dad) lucky for me they all live back in NZ. But when they do visit, the dogs will have to go sleep in the garage, it won't kill them to stay out there for a week.
However because of the pups i would definitely not be kicking them outside.