The relationship list is pretty extensive, but there’s still some gaps i’d love to have fixed. Stepchildren is a big one – if I make “Molly” the step-parent of “John”, when I go look at Molly’s relations, it puts “John” under “Adopted Children”, which is not the same thing as “Step-Child”.
The ability to add custom fields, or at least expanding the available list, would be immensely helpful for accuracy.