My great grandmother was Gertrude Odenbrett, i do not know her mother's name and i believe she was born in Milwaukee in 1875. She married (?) a Gustave Rietz and had a son named Harry who was brought up by his grand parents. I have no names for them. I have just started searching and have no idea how to get birth certificates that are that old!
If this lines up with any of your information, pleae email me at firstname.lastname@example.org