I have only 2 remaining Baktrios FMs, one of them had 2 daughters and the other none at all. This aggravates me, as he has a mistress, herbalist and a trait that gives +2 (I think) to fertility, yet he is 49 years old and nothing (no flaccid trait or anything like it)

Their father died at like 72, had over 25 battles, subdued Saka, killed the Seleukid King and many more nice things, so I would not like it if his name died with the 2 bureaucrat brats.

Is there anything I could do to force them?