Which of the sons is your Grandfather?
John, Donald or Larry?
You will have to find out who Leon's father is.
What we know so far is that Andreas Kubala, and Teresa Kubala(we are guessing that sister-in-law) arrived in 1860 Galveston, Texas via Jeverland. They were the 1st Kubala's in Texas. Some may have come later and all of these have the same thing in common. Being from Frenstat, Moravia. Your Leon is not part of Teresa, but may be in Andreas' family. Nancy Bowman is the contact for that family. You will have to get the father of Leon.