Sarek has always slightly disapproved of Spock's Starfleet career, but the new movie leads us to believe that this is because Spock chose against joining the Vulcan Science Academy. I don't think Sarek ever treated Spock badly, though. I'm not sure where you're getting that. He was always a very loving father, even if Spock's career choice may have initially disappointed him. Spoiler: Sarek, Amanda, and Spock in the new movie I almost feel like nuSarek might embrace Spock's lifestyle now that Amanda is dead. It will help to keep her spirit alive. As Spock said, "Earth is now the only home I have left." As for marriage, why is it illogical for Sarek to marry Amanda? Sarek loved her. She loved him. It also provided a way for him to learn more about humans for his work as Ambassador. I'm not seeing the problem.