Frank Albert Grant was most likely born on 17 Jan 1884 his headstone indicates that birth was 17 Jan 1883 which would make his sister to be a few weeks older than Frank. The Death Registration indicates that Frank was 5 years old at the time of his early death while his sister was 6 years old.
"British Columbia Death Registrations, 1872-1986; 1992-1993", database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FLVY-RXS : 8 November 2017), Robert Grant in entry for Frank Albert Grant, 1889.
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