There aren't many photos of Luther Jackson actually... which is strange, as he is relatively famous in his own right as a Blues vocalist, with his band The Loose Cannon Blues Band.
However here is one I found for you:
Luther's brother, Joe Jackson, was manager of his children but has been accused by more than one of his children of abuse. Michael did say though, that the way his father drove him, helped him become the world famous artist we all admired.
Luther and Joe have three other siblings, sisters Verna Mae and Lula Mae, and brother Lawrence. None of them have really enjoyed celebrity status either though, despite musical talent running through the family!