My name is Helen and my brother and I are doing research on this family. We are down Alexander's line, but through his first wife Sarah Blackshear. John Christian's father is Fridericus Wilhelmus Gabler and his mother is Anna Ihmsen.
If you look at the public tree of All In The Family, you can see this. You can also see Alexander's tombstone along with Hannah Hopton's.
If you want any information that you don't see there, you can e-mail me at email@example.com
. We are still trying to find Fridericus's parents, but it appears that he moved away from then and was with the Ihmsens and became a glass blower.