Answer:
What do you call the mother-in-law of your sister's husband?
The edge of earth and bread.
Take one royal word in the plural and make it singular by adding one letter
What goes up but never comes down?
Inside a burning house, this thing is best to make. And best to make it quickly, before the fire's too much to take.
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?