Answer:
Sally, Lisa, and Bernadette are triplets. But Sally and Lisa share something that Bernandette does not. What is it?
Edible items purchased in large quantities.
Nothing specific, but more than a few. This many clustered, together will do.
Touch this and you'll regret it. But if it's cold, you won't forget it. What is it?
What is at the end of a rainbow?
I am a rock group with four members. All dead one was assassinated.