Why did Jacob marry Rachel?
Because his father told him to, and because he thought she was hot.
Well, almost but, not exactly....................
Jacob loved Rachel and definitely thought she was beautifully HOT! (I do hope Jacob loved Rachel for more than her looks.)
I think Jacob's mother, Rebekah, sent Jacob to his Uncle Laban's (Rebekah's brother) in fear that Esau might kill Jacob. I'm not really sure if Isaac had anything to do with Jacob going to Laban's.
Isaac seemed kinda "passive" to me. So much is recorded with Abraham and so much recorded with Jacob yet, Isaac seems kinda mellow.