Talk to Ursula

Since you've settled Ilse's husband, it's time for you to talk to Ursula, Muller's mother in law. You try to be as partial as you can since there's no point in totally supporting Muller when his wife is more influential.

You tell her about all the options that she has, which are to get her daughter divorce her husband or adopt her daughter's husband's bastard son when his mistress gives birth to the said son. When Ursula raises the issue regarding Ilse's husband, you tell her that has been taken care of, and she becomes impressed by your initiative.

After some lengthy discussion, you manage to convince her that while Suzanne shouldn't divorce her husband, Ursula and her should see whether Ilse gives birth to a boy before determining her next step. "You seem to be partial to my son in law, Your Highness," she remarks at the end of your long discussion.