The redefinition of family doesn't connect to any of the other anthropological terms we use, it just hangs there completely irrelevant in the necessity to be everything to everyone one, making it rather meaningless in it's function.
But it is interesting about the 'good times and bad', because most people bail when things goes bad. Spouses leave and adult children do not stay connected to parents. On both elements it's a foolish thought.
I did looked up it's actually term and Oregon State pretty much refuses to give it a definition.
"family - families are universal in cultures, but their definition and dynamics are changing. A very inclusive definition is two or more people who define themselves as a family. Also see "extended family," "nuclear family"
That could be anything...
Otherwise the definitions of family are still the same. For instance
"bilineal - descent in which the individual figures kinship through both the father's and mother's descent group."
genealogy - a family tree or web of kinship relationships traced through parents and children. Also called a kindred
kinship chart - the diagram of kinship relations using symbols to indicate males, females, marriages, divorces, siblings, descent, and deceased relatives. Also called a kindred diagram.