Hi Robert
Sue asked me to look for the USA Corrins for you. I live in the states and often help Sue with the USA MAnx.
I also found the same info on MAry Ann that you have.
Charlotte Chapman Corrin marr John Gunn 18 Aug 1891, the same day her mother died how sad for her. Charlotte and John had 4 children, Douglas and Alfred twins b 4 July 1892, Mona b 9 Sept 1894 and Harold b 30 Jan 1900.
Douglas d July 1893, Alfred marr prob twice to Letha and then Sophia, he d July 1974 in Florida. children unk. Harold d 30 Aug 1978 unk marr or childen. Mona marr Frederick Brockhoff i child. Mona d 28 Mar 1985.

Lydia marr Frederick Schmandt. Fred d 10 Sept 1924 and ? d for Lydia 4 jan 1927 but she was listed as Lillian. Fred's WW1 draft registration card list his wife as Lily ? nickname had 1 dau.

Josephine Annie found in the 1900 USA Ill census living with Charlotte and family along with Lydia.
josephine not found after 1900. ? marr.

hope this helps fill in a few holes for you.
Carol