Klaus is the oldest Mickelson sibling, hes also a hybrid and very protective of his siblings. Hes got a daughter, Hope that is a Tribrid. Hope's mother is Hayley, but Klaus is married to Y/N Salvatore.

Hayley left hope with Y/N and hope started seeing Y/N as her mom, but Klaus don't know that. Klaus and Y/N love each other, never leaving each other. Y/N is a vampire and witch.

Hope is getting picked on at school, Y/N immediately got protective and it's Klaus's first time seeing.