Don't be stupid, Keimi is your daughter, you can't stop thinking of her that way. You're not that type of person.

I don't really see how going out with both of them is going to give her more confidence, unless you somehow manage to not act as a policeman and don't watch over them like a hawk... Which I doubt you can do.

[Ikki has so little faith in you.]

Anyway, first you should settle yourself with Grell properly before worrying about her relationship with Keimi.