Parental favouritism

Unequal relationships between parents and children
Sibling inequality
Preferential parental affection
The nature of human individuality presupposes differences in relationships between parents and their children. Those relationships may become problematic when a parent is unable to treat each child in an equally affectionate and engaging manner. If a parent feels more protective of one child or identifies with one child more than her siblings, destructive familial relationships are likely to occur.
(F) Fuzzy exceptional problems