Can anyone recommend anything in regards to building up the power of a Clan orFamily? By this i mean the MC staying with his Family/ Clan and building it into a powerhouse of some sort.
Otherworldly Evil Monarch (note: I only read up to the mid-200s chapters, so I don't know how it is now)
The Scholars Reincarnation (read the manhwa) Rebirth of The Heavenly Demon (I wish this was translated, but nope company-blocked)
World of Cultivation - It might not seem like it at some point but stick with it and it will make sense. Probably the only novel I've read that's really about clan building in a macro sense. Very good read over all. Last 50 chapters though leave a lot to be desired (extremely rushed ending) Zhanxian - Too early to tell, but seems like this one fits as well.
Transcending the Nine Heavens. . Suikoden... Sorry about the second one, but it's a really good game.
It's not about clan building though? At least, I can't remember that being the plot of any of them. Usually they're about saving the world. Or are you talking about the castle feature? That's not really a clan so much as it is a town/army though, and I'm not sure any of them survive long after the end of the game.