I mean, Wen Ning and Wen Qing are definitely positioned in the show as being sort of, unwilling participants in the Wen Clan fun family conquest scheme, but like, never explicitly as a whole separate Sect to that of the Qishan Wen as a whole, in my opinion at least (I consider Wen Qing being sent to Cloud Recesses as a Wen Sect representative to be evidence of the exact opposite)! I think people took the fact that a lot of the background characters who lived on Dafanshan during the Road Trip sequence ended up in the Burial Mounds as evidence they were like, their own thing, but it was never explicitly stated they were a separate sect. But! To be fair, this is partly a personal preference thing, I think it becomes a much more poorly constructed story if they're only there by accident, because of all the other narrative threads about choices and the lack thereof.