Otto and Hulda Junghans' children were both married in Mequon, Wisconsin.
Eldest child Otto was married to Ella Heiden. Their license was issued on January 11, 1910.
Here is a photo of the wedding of Martha Junghans and John Dvonik. While I do not know the other people in the photo, it's likely Martha's brother Otto and parents Otto Sr and Hulda are also in the photo.
If I were to make a guess, Otto Sr and Hulda Junghans are to the left of Martha (with the veil) in the center and standing behind them, Otto Jr and Ella Junghans.
I have yet to meet anyone that is able to verify the rest of the people in the photo.
This photo of Martha Junghans and John Dvonik was taken in 1913, presumably after they were married.
Martha Junghans and John Dvonik's marriage license was issued December 16, 1912.
I don't know the exact date they were married, but I would assume it was sometime in December, though census records (considering their inaccuracies) indicated 1913.