A nice granduncle

This week's patron of the week is a man who approached the desk to say, "I have a question for you that you've probably never had before. My brother's daughter's step-daughter is graduating this year and I want to send her a card. How can I find out what my relationship is with her?" I.e., he wanted to sign the card "Love, Your [Relative] Bob," but didn't know what to fill in "[Relative]" with. A check of Merriam Webster for my hypothesis of "great uncle" led to the discovery that step-"granduncle" is technically correct.

Anyway, we had fun.