John Phillip Marshall (Musseau) was my grandfather's 1st cousin. Grandfather was Charles Morgan Musseau of Mouse Island, Port aux Basques.
Assuming this is the same John P Marshall that was married to Alfreda Pope & born 1883 (I don't know his date of death)
The Marshall's, Musseau's, Mushrow's, Musson's, etc., in my family tree came from Joseph Mousseau of Quebec who settled in Nfld. at the age of about 40. He is transcrided in census as Joseph Miessau & Missau & in the Wix diaries his 5 children are baptized(transcribed) as Miepan I believe.
Contact me via email Bruce. firstname.lastname@example.org