Background
39 years ago, a good friend and I had sex and she got pregnant just before I went into the Navy. After three months, I came back from boot camp. I found out she also had slept with my best friend while I was away. Regardless, deep down inside I felt like the baby girl was still my child, but definitely not 100% sure!
I was married for 22 years and have a 15-year-old daughter.
In about 2012, the baby girl is now 39 years old and found me on a social media account. About 2 years ago, her mom also reached out through the same site concerned for her daughter and wanted to meet me to make sure I wasn't a weirdo. Wouldn't you know it the mom and I instantly reconnected and have been dating for 2 years now.
Current situation
The three of us have completed and confirmed DNA paternity. I've told my 15-year-old daughter that she has an older sister, but she isn't really interested in meeting. I think my ex-wife has influenced my daughter in some way.
My older daughter will be in town in a few weeks and I want the two girls to meet face to face, but don't know how to convince my youngest that it's a good thing and not to be scared or nervous.
How do I convince my youngest daughter to meet her older sister?