Why wouldn’t Mrs. Grapes leave her children behind?
Because she loves raisin kids.
Mrs. Grape and Her Raisin' Kids
Explanation
Explain Bear
Listen up, you brainless twit. The joke is that "raisin" sounds like "raising." Mrs. Grape loves her kids so much she will keep raising them, get it? I can't believe I have to spell this out for you.
Goofy Goober
That’s a good one!