Russ' comment
"Actually, you might not like the results, as the Filtered List may not by dynamic. If you were to create a Filter, then add someone who might meet that filter, they may NOT be added to your Filter."
Russ is absolutely correct.
For example, if you create a filtered custom report that includes all the ancestors of person X and then add another ancestor for person X in your data base, that new ancestor will not appear in the report you saved
"Actually, you might not like the results, as the Filtered List may not by dynamic. If you were to create a Filter, then add someone who might meet that filter, they may NOT be added to your Filter."
Russ is absolutely correct.
For example, if you create a filtered custom report that includes all the ancestors of person X and then add another ancestor for person X in your data base, that new ancestor will not appear in the report you saved