Hi, I am not related. Hope this helps. Rp.
I would think that there is a birth record for Robert in Green Lake County. In the 1920 census, Helen & her parents & siblings lived in Berlin, Green Lake County. There was a Wright family that lived there too in 1920.
Helen & Anton Baade were married in 1925 at St. Michael's church in Berlin. Have you tried to find a baptismal record for Robert in one of the Berlin churches? St. Michael's may be a good beginning.