
As their parent, Keiichi has a right to tell them.
But as their lover, Keiichi has a choice to tell them and what his thoughts are on them possibly leaving. (Which they won't, they're in love with him to death. Unless blackmail happens. Fingers crossed that doesn't happen!)
Despite her giving birth to them, as the woman who literally abandoned them and didn't give a shit about what happened to them, she has no right to them anymore. Ren and Takumi are already adults with their own dreams and aspirations. There's no room for her in their lives. Also, pretty selfish and fucking shallow of her to come crawling back to have them take over a company that they could give two shit's about. I'd purposely run it into the ground lol
Well someone's a little negative nancy...( ̄ ³ ̄)