Hello @lasseehlers sorry to hear about your distress...
You love your children so much, so never give up fighting for them... you have rights as a father.
Before you expose her (the mother) take her to court.
Do you pay child support for the two children??... every child has the right to know who their real father is.
She cannot take that away from you.

P.S. Nice T.Shirt good Thinking 🤔 👍