And I agree that adolescence was a lot about father-sons relationships, mostly Jamie and his dad's, but also the one between the policeman and his son in the second episode set in the school.
And that's why the painful thing that Jacob Elordi and Victor enact is a father and son relationship that is very relatable in the film, very relatable and very moving by the end.
This can be stored as nodes with many pointers, very much like a tree, but there is no notion of roots and leaves, and children and parents… Anything can point to anything!