Answer:
What do you call the mother-in-law of your sister's husband?
You can tumble in it, Roll in it, Burn it, Animals eat it, Used to cover floors, Still used beyond stall doors. Freshens whatever it is placed on, Absorbs whatever is poured into it. What is it?
What object has keys that open no locks, space but no room, and you can enter but not go in?
Not a comb or a brush but makes the hair feel plush. What is it?
Cold head and feet; Round as a ball; Always turning around itself.
Those with eyes bigger than their stomach will definitely leave the restaurant with one of them. It is named after a house pet as well.