When you implement the clan system, you definitely need to increase the cap for family members, as it stands now it hovers around 20, a clan needs a minimum of 100. Just like the recent update with the sect system, just use the same system but for clan members, with it showing which family members are talented and which are not. You could also make the clans have ranks depending on what kind of cultivators they have in it all the way up to the peak heavenly clan, for example 3 cultivators of the body refining stage you have a basic cultivation clan, 3 at the auterach stage you have a devine clan.
Their is a generic moment when doing sect missions where a group of cultivators block the road, if the clan rank is high enough they could let you through. Or other such moments where the rank of the clan shows, that it's less likely for others to attack you, and if someone kills one of your clan members in a duel or ambush you should have the option to retaliate against them.
I know it sounds cliche but come on why have a big clan if you can't use your powers, I read so many light novels with this and it would be nice to do it.