Well, yes. For awhile they did. Not the grades themselves but certainly the reason I got them followed me. I coasted in high school. If I could get B’s and never do homework, that’s just what I did for even my AP classes. I was secretive about struggles and didn’t like to ask for help. I freaked out in the face of challenge. I took my bad habits and hang-ups to college with me and made for a difficult transition and took some work to overcome. Some took longer than college to push through. My kids had some foibles, one due to anxiety that she had to address, the other due to bad organizational skills that they had to commit to fixing but they did and so can you. My take is don’t stress about the grades but pay attention to the why. And no, don’t stress about further in-laws.