When I imagine Ralph, I see an outsider who is avoided by the other children and ignored by the teachers, with a loving but somehow helpless father. ...being lonely , not being part of the group, not understanding the rules of the world around him.
I think it has to do with the need for attention and closeness. When you lack it, you turn to the person who has already fulfilled this need for you. It's hard to live with unfulfilled needs that you can't fulfill yourself. I guess the key is to learn how to find a relationship where your feelings are reciprocated (and to find out when they are not). I know that feeling and I don't have a solution.
I don't know whether this is a characteristic that is more prevalent in autistic people.
Lvm could be the way to go. Start with the minimum amount of partitions (i.e. / and /boot and swap as lv, maybe efi as a real partition). Add additional lv later if/ when you need them. You can always re-size a partition and the wrapping lv when you want to re- distribute storage-space.
I never needed more than these partitions. But that is just my use case.
Edit: oh. Missed the Multi boot point. Forget what I wrote. :)