Tangled Family Tree/Playing With

Straight: Bob's genealogy makes no sense.

Exaggerated: Bob has two fathers and no mother, his son is his grandfather, there are three million clones of Bob, and just about everybody's committed incest more than once.

Subverted: All the people claiming to be his family are mistaken, and he simply has the standard extended family...

Double subverted: ...who turn out to be an incestuous wreck themselves.