Family Tubby

A "Family Tubby" is something you give and/or receive from a family member in a bathtub. Giving a "family tubby" primely composes of bathing and caressing a younger family member (mainly a sibling) in a bathtub without remorse or regret after the fact.

"Diego, did you really touch your sister inappropriately when you were bathing her, she's only 5!"
"Well, yes, I did, but it was only a Family Tubby!"