Abusive Parents: Uncle Matthew and Aunt Sadie aren't exactly abusive but don't seem to be able raise their children well, they don't give their girls much of an education and don't take in the changing times so raise them to Victorian ideals.
Amazingly Embarrassing Parents: Aunt Sadie might be distant and unforced but Uncle Matthew is an nightmare. The fact that he is based on the author's father is worrying.
Big, Screwed-Up Family: The Radlett family could be seen as a high-functioning example. There's considerable love there, especially between the siblings, but also a great deal of not entirely benign eccentricity and some dubious child-rearing.
Death by Childbirth: Linda's fate. The Doctor's did warn her that this might happen if she had a second child.