Hi,
This is a very old post and I am not sure if I should reply!
But it is worth a try!
I too am looking for information on the same Weidman's.
My natural grandmother was Helen Dorothy Weidman, her parents were William Freidrick Weidman and Jane(Walker, I think. I too would like information on William's father from France. Please let me know if we can be of help to each other.