By the way, Judy,
Perhaps? what you really want to add are both the spouses and any genetic descendants of those spouses but who are not genetic descendants of the ancestor, e.g. children of a spouse by other partners. If so, when you finish above, click the Select All button again, and click the Add Others again. Now the count will include "family" descendants who are not direct genetic descendants since a child of a spouse by another partner has no genetic relationship to the ancestor of interest.
Hope this gives you ideas,