Answer:
What do you call the mother-in-law of your sister's husband?
Break it and it gets better, immediately set and harder to break again.
As strong as love, more dangerous than cancer.
They keep secrets locked away. And you pass through them each day. For each one there is a key, They respond to sesame.
With sharp edged wit and pointed poise. It can settle disputes without making a noise.
I am a rock group with four members. All dead one was assassinated.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?