Yes, I actually *met* my son!
I was working at a Renaissance Faire a couple of decades ago, and our group was setting up "families" in order to present a more cohesive setup.
A young man asked if he and a 16-yr-old friend could portray my sons. I agreed. The older fellow left the group fairly quickly, but his friend stayed.
The theatrical family relationship that developed with my younger "son" worked so well that we decided to continue it into the present. He calls me "Mom" and I call him "son", and he's part of our bio-family gatherings.
It does confuse some people a bit that I know almost nothing about his birth, and have no baby pictures to share!