A pair of con artists mistakenly believe Grandpa Jetson is rich when they see him using Mr. Spacely's credit card to buy gifts for his wife and mother-in-law Mrs. Meltdown, the latter having moved in with them to his dismay. The boss hopes Grandpa can romance Mrs. Meltdown so she can move out, but the old man falls for the young female con, which could lead to jeopardy if they aren't careful.