I'm starting to incubate my next company and don't want to have to explain to investors why one of my cofounders is calling himself a founder when I'm still lab

I'm starting to incubate my next company and don't want to have to explain to investors why one of my cofounders is calling himself a founder when I'm still labeling myself a cofounder. Additionally, he's phrasing his work profile/resumes etc to indicate that he was the originator for the idea of the company.