Singletons (non twins) may have experiences similar to this, but I doubt you will truly understand what it is to be an uncle daddy. If you are a regular reader, you may know that my best friend is my identical twin brother, John. This coming weekend, he will be the best man at my wedding just like I was the best man at his wedding almost 9 years ago. His daughter will be our flower girl.
When John's kids were little, they confused us frequently. In fact one time JT wouldn't leave my side and cried whenever I tried to leave, saying "daddy, don't go!" John walked in and out of the room and even left the house to go shopping. JT was content as long as he was with "daddy."
Throughout the years, as the kids have grown, they can tell us apart. They still mistakenly call me daddy sometimes. John and I have been referring to me as uncle daddy for a few years now. The kids will start to say daddy when they see me and then switch to the word uncle.
This is one of the greatest joys in the world. John's kids treat me like I am more than just an uncle. I have other nieces and nephews, but I don't know them as well. Some of that has to do with their location, but most of it is because John is my best friend and we make sure to take time to see each other. That time frequently includes kids. John and his kids were the first family to meet my fiance David too.
John's kids are special to me in so many ways. I love all of my nieces and nephews, but these two little ones are the only people in the world who could ever call me uncle daddy.