Hi Parkereham
Welcome to RootsChat
You may well find that David was the first in his family to break into the candy business...
This is his birth here
https://familysearch.org/ark:/61903/1:1:XYBX-Y9NHe was in the US by the mid 1880s wasn't he, going by his marriage details
https://familysearch.org/ark:/61903/1:1:24SK-NXDThis looks a likely entry for him in the 1871 census with his family:
John Millar 44 agr. lab. b. Markinch, fifeshire
Euphemia Millar 41 b. Lenches (?spl), fifeshire
John Millar 78 father joiner b. St Andrew, fifeshire
Margaret Millar 16 b. Kennoway, fifeshire
Janet Millar 14 b. Kennoway, fifeshire
Euphemia Millar 12 b. Kennoway, fifeshire
Isabella Millar 10 b. Kircaldy, fifeshire
David Millar 7 b. Kircaldy, fifeshire
William Millar 5 b. Kircaldy, fifeshire
James Millar 3 b. Kircaldy, fifeshire
Andrew Millar 5 Months b. Kircaldy, fifeshire
Address: 9 Charlotte St, Kirkcaldy Fife
Parents' marriage/banns look to have been in 1851
https://familysearch.org/ark:/61903/1:1:XT53-TBH and
https://familysearch.org/ark:/61903/1:1:XTPB-TJN This date is before the start of official registration in Scotland from 1855. You would need to check John Millar and wife Euphemia's death cert to be able to verify their parents' full names (assuming they stayed in Scotland and didn't head off also to the US?).
Monica