My family chart match's up with the charts that I have and they match perfectly:
Nicolas Karleskind (b. july 24,1458-may 28, 1825) married Catherine Sissung (b. 1759- May 28, 1825), Daughter of Antoine Sissung and Catherine Utter of Schalback. They had 12 children, including Catherine (b. mar 23, 1786) who married Georges Antoine Gantner (b. June 14, 1786) on Aug 10, 1809. He was the son of Joseph Gantner and Anne Marie Isch of Haut-Clocher.
Let me know if you need more info on the Karleskind line, but that's where my info ends for the Gantner line which resided in Haut-Clocher, Alsace-Lorraine.
And She did have a brother names Nicolas, who married distant cousins twice. Catherine Gantner is the sister of my 5th great grandfather, Jean Pierre & Genevieve Karleskind.
I hope this helps, and let me know if you need more info. But I am sure we are both decsendants from Bartholome Karleskind (b. before 1630). I can give you info tracing back to him, but I am currently getting it digitally formatted now.