i use very much groups for selections, but i have question about the option of direct descendants only, in my opinion there can only be descendants with the same family name, so als de familiname go and not other familie members. because with me now is also a partner of a descent selected..
There are also less common situations where a child - male or female - doesn’t have the same surname as the father. Such children are still direct descendants.
As the guys said you are going to have a lot of different surnames if you pick direct descendants – if you want the male direct descendants of a person (such as your father’s surname) you can make a group by picking the first known ancestor then Genetics-- Y chromosome–descendants of highlighted person…