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I don't see any reason not to contact the birth mother of your child. If she doesn't want to know, she can tell you, but let it be her choice to make.

I think what Lumpkin meant to say is that it's not okay for you to attempt to directly contact to a minor (your daughter is 15)...it generally sets up a difficult situation and lots of conflict for everyone. Even if the child welcomes it initially, there may be lots of fallout it would be best to avoid. It's just not a good idea.

If you want to contact your ex- go for it. If you want to contact your daughter, you need to find a way to get in touch with her parents first, introduce yourself, ask them to get in touch with you or share some info with their duaghter, but be prepared that you may have to wait until she is older for direct contact with the girl. Hopefully her parents will handle things well and you can begin building a relationship of trust on both sides. But either way you don't want to put your daughter in the middle of a tug-of-war between you and her parents or set up a situation where she is lying to them or sneaking, or ruin a chance at having a good relationship with everyone and being welcome in her family because you get started on the wrong foot.

Best wishes! Keep us updated!