The "I" in David Peters name indicates that he was the first child born to his parents. This is done to distinguish him from a brother also named David (III). Both David's died at a young age.
"Prince Edward Island Baptism Card Index, 1721-1885," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCXJ-NT8 : 12 December 2014), David Peters, 31 May 1862; citing p. 57, volume 1, , Prince Edward Island, Public Archives, Charlottetown; FHL microfilm 1,487,765.
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