Signing the inside of a birthday card?

Here's what is almost certainly a silly question and not terribly important but I would appreciate any guidance from someone more socially adept than me. I'm a single man with a brother-in-law and a couple adult nephews through marriage. The typical way in our family to sign a birthday card is with "Love, Signature" - but I find this awkward with those relationships. I don't really want to attempt anything clever or profound inside what is usually a jokey card - just some nice signature that doesn't seem out of place. I thought of just writing "Happy Birthday, Signature" but that usually repeats what's already printed inside the card. Any suggestions? Thanks.