I have recently been doing some family history searching myself. I am the grandson of Karl, brother of Kermit - both sons of Mercedes. Hello!
I only knew my grandfather for a few months. He was not in my mother's life, but appeared suddenly when I was a kid, took me out of school and flew me around the world. This included Puerto Rico. We stayed with Nuni, Jaimie and their kids and visited family history spots in Mayaguez, San Juan and San German. This included Mercedes grave site and a pirate monument we are supposedly related to. I still have all the photos.
After the trip, he disappeared. and disconnected. I never saw him again. He was a Chicago police detective and died in 2005.
Anyway, it's nice to know there are others out there piecing the tree together.