zaneclark wrote:I cannot find the answer as to how families are assigned to quorums for HT. . . . is there also a default process based on age, etc.?
By direction of a First Presidency letter many years ago, any elder and his family is assigned to the elders quorum, and anyone who is not an elder, with his or her family, is assigned to the high priests. After that default assignment in the system, you are correct that the bishop can (and should), in counsel with priesthood leaders, review the default assignment and make adjustments.
And no, I do not believe it (the default assignment process) is in the Handbook so you did not miss it there. But the computers had to have somewhere to start, and that is how they do it.