I apologize in advance as it may seem I am singling out your posts, that is certainly not the case. You just happen to bring up some possible scenarios or ideas that I can clearly refute based on personal knowledge.
I can state with the utmost confidence that TS would not keep his past a secret from Katrina, as all those close to him and his family were well aware of his past. Perhaps he may have kept it from his daughters as logically makes no sense to divulge that sort of information to young children, and I am unsure as to if they know now that they are older, or if they just found out now via the media frenzy.