I have twin daughters I've never met. They would be 20 years old now.
why did you never meet them?
I never knew I had twin daughters.
As a father you're supposed to be your daughter's lives. It's not ok that you abandoned them. You should try to reconnect with them.
They don't care anymore.
That's not an excuse to try to reach out and connect with them.  Go and at least try to see them face-to-face.