Question

one difference: one has a each sentence means. what does the first sentence mean? someone is asking grandma to eat with us. someone is suggesting we eat grandma.

Explanation:

The first - suggested meaning is a normal social invitation, asking Grandma to join in a meal. The second is an absurd and cannibalistic - sounding interpretation. The more reasonable and likely meaning is the first one as the second is highly unlikely in normal social contexts.

Answer:

Someone is asking Grandma to eat with us.