Cutting and pasting from what we posted on another site:
Since some of us are into Astrology, we consulted one of our books that describes the personality traits of the 144 possible Sun-Moon combinations. Our theory was/is that since each system member is unique, only one person could have any given combination.
Before proceeding further, we eliminated our two ageless non-corporeals from the process; being ageless, they don't have a chronological point of origin. We also eliminated our six-month-old and our 18-month-old, whom we believe are too young to have measurable personality traits.
Once we determined the appropriate combination for a specific system member, we went to the chart for our body's birth year and looked for when that particular Sun-Moon combination was in effect. This usually results in a two-to-three-day window from which we would choose whichever date feels better.
Fun fact: No individual in the system has the body's birthday. It wasn't intentional--merely a fringe benefit.

It illustrates the notion that the whole may be different from the sum of its parts.
PS: We've never had the time or the energy to observe individual birthdays. Our system is too large for that. We see the individual birthdays as a combination of data points and individual validation. But for practical purposes, we only really observe the body's birthday--it's just plain easier. And it's become less and less of a priority as the body's gotten older.
MDs
Body cis ♀ (1962). Realized 1996 that we're multiple. System of 47, all cis: 42 ♀, 5 ♂; 17 littles (0-7+), 9 middles (8-11+), 14 teens (12-17+), 5 bigs (18+), + formless yin/yang.
Notable: Charity 25 (oldest), Deborah 23, Drew 23f, Mary 23, Rachel 23, Laura 17.5, Allegra 17, Cass 17, shawn 16f.
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