Mmmmmmmmmmm difficult if migration time is not known? what makes you think he did'nt arrive till then? example:

1851
William Moffatt 24 with
James Moffatt 50 b Scotland
+
John 26
+
Matthew 24
+
Jane 16
+
James 12
+
Mary 10
+
Sarah 8
+
Alex'der 6

Jane downward b Canada

District: Bruce County
District Number: 3
Sub-District: Kincardine
Sub-District Number: 21

??????????????