I get that you hate Jerry. (Also that you apparently feel that edits made while you are typing constitute a personal assault on you. That doesn’t strike you as a rather self-involved reaction? At all?)
But, yes, a person’s father is at least a role model to be rejected, if not a role model to be followed. It doesn’t make psychological sense for someone’s father, in a nuclear family, to be summarily dismissed as “superfluous” by members of that family. They might hate him; they might despise him. They might declare that he’s “superfluous” as a way of demonstrating their contempt.
But their contempt comes from the fact that they feel he’s failing to fulfill the role he should fulfill. The fact that there is such a role means that the father is not superfluous; the expectations about that role are there whether the father meets them or not. The father is important, whether in a negative way or a positive way.
That’s human psychology. And this show is successful, in part, because it doesn’t ignore human psychology.