Christine, I'm checking a rabbit trail for hader/haider family members. What do you know about Tekla to date? I don't know how much you have, but I can supply a note from my family's testimony that may help in the search.
Now, what I have is a miniscule piece from the late 1800s to the early 1900s, but it may help. I'm holding onto only a thread of information on my grandmother, Miltilda Caroline Cross. She married my grandfather, Charles P. Hammond Bledsoe.
One of her sisters married a "Hader." At least that's the spelling I have. I'm up against a wall right now, with absolutely no linage information about her family, before her. She and, possibly, her sisters may have lived with a Murray family as orphans.