My wife’s 82 year old grandmother told this joke today at our family dinner

A grandfather and grandmother were visiting their son and family for a night. The father asked the son if he could have one if his viagra. The son said yes but that he needed to leave $10 in the cabinet.

The next morning the son found $110 cash next to the bottle. He went to his father and said “Dad it was only $10, you made a mistake.”

The grandfather responded “The $10 is from me and the $100 is from your mother.”