How many sets of brothers can you name in football? The Charltons? The Nevilles? The Toure brothers?
This weekend there'll be sibling rivalry at Villa Park as Swansea City's Andre Ayew takes on Aston Villa's Jordan Ayew.
Andre tells Sport Wales there'll be no love lost between them - for 90 minutes on the pitch.
You can watch BBC Sport Wales at 21:00 BST on Friday 23 October on BBC Two Wales, Football Focus on BBC One at 12:10 Saturday 24 October and via the iPlayer.