There have been instances in which relatives competed against each other at the Grammys. Below are examples that I can think of:
Aretha Franklin winning R&B Female in 1969 over her sister Erma Franklin’s original version of Piece Of My Heart.
Dionne Warwick (That’s What Friends Are For) competing against Whitney Houston (Greatest Love Of All) for Record of the Year in 1987 both losing to Steve Winwood’s Higher Love.
Can you think of any other instances?