I forgot about Tuvok. Sarek isn’t actually a normal Vulcan. He married two human wives after his original fiancé/wife/bondmate, the mother of Sybok, either died or divorced him. Sybok’s mother was either a Vulcan princess or priestess, depending on the material, but from a high status family, as was Sarek. She seems to have taken his son away from him or he was in some way prevented from being involved in the boy’s early childhood.
So after that disastrous proper marriage, he rebelled by marrying Amanda and told everyone he was experimenting by trying to integrate human and Vulcan cultures. He was proving something, maybe to his own parents or to his ex wife or to his ex wife’s family. But then, after rebelling, he set out to make his half human son the most perfectly Vulcan-y Vulcan that ever was and to turn his human foster daughter into a Vulcan and he disparaged their human traits. In The Original Series, he insisted Amanda act in what seems to be the traditional way for Vulcan wives, obeying him in public. Why exactly did Amanda put up with this guy? And yet she loved him and Sarek was desperate enough to save young Michael that he gave up a piece of his soul to do it. His children are genuinely part of him. A study in contradictions.