Robert married Sarah Dorsey [dau. of Capt. Joshua], daughter of Captain Joshua Dorsey and Ann Ridgely. (Sarah Dorsey [dau. of Capt. Joshua] was born on 27 May 1733 in Christ Church, Queen Caroline Parish, Anne Arundel, Maryland, (United States).)
1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi, http://www.rootsweb.ancestry.com/~mdannear/firstfam/dorsey/b7759.htm#P7759.