It's not obsession...

No wait, it is! But with good reason I'm trying to collect my foals bloodline in pictures, hard since most are deceased but still it's a project that's coming along!

Of course there's the dam: hot rod (obviously a stepper)
Then the sire: breaker (heza art breaker)
Breakers sire: art of gold
And hot rods sire: booger ( keep the clue)