I don't yet know if Annie had any brothers, but I would think it quite likely. I am going to try to get her birth certificate and if I can find baptism records I could find out more about brothers and sisters. Annie's age at marriage in June 1878 was given as 20, which means she was born in 1858. This would make Felix a much older brother, but does not mean there is no connection.
Have you tried to get a copy of the marriage certificate? That should give you the fathers' names and probably an address.
Let's keep in touch if more details emerge.