I have no idea of what Minnie's middle name is other than "A".
Here are some possibilites of Robert & Minnie's children that I have not checked out yet:
1. Fern C. McGaw 8 Jan 1898-4 Dec 1990 MI (no other info)
2. Robert LeRoy McGaw 1 Sept 1912 Oshtemo-7 Oct 1982 Royal Oak was last residence & last benefits
3. Charles McGaw (I think he was the middle child, but not 100% sure)--there are 3 possibles 30 Sept 1910- April 1978 last res Chicago and last benefits ROYAL OAKSS issued in NY 2 April 1900-May 1975 last residence Plainwell, Allergan, MISS issued in MI 10 Oct 1910-Aug 1974last residence Dixon, Webster, KYSS issued from MI