Al, got some information for you on your Crichton and Jackson families - not sure if you already have this
Old Parochial Records - Airlie (Births) - 4th February 1823
CREIGHTON - John Creighton and Isabell Sinclair at Littleton had a son born this day - Alexander Nicoll
Dundee 1851 Census (282 - Bk.13, page 11 - 40)
110 Seagate, Dundee
John Crichton Head mar. 51 Porter At Tay Ferry Born Airlie
Isabella Sinclair Wife Mar. 54 Born Eassie
Alexander Crichton Son Un.27 Power Loom Tenter?
Born Airlie
John Crichton Son Un.age 11 Scholar at home Born Dundee
Martha Jack Mother-in-Law Wid. 77 No Occup. Born Kirriemuir
1851 Dundee Census (Book 47, page 26 - 111)
Hilltown, Dundee
James Jackson Head Mar. 45 Railway Guard Born Ireland
Hellen Jackson Wife Mar 50 Born Forfarshire, Murroes
James Jackson Son 20 Un. Brush Maker Appr. Born Dundee
Barbara Jackson dau. Un 19 Power Loom Weaver, Born Dundee
Matilda Jackson dau. Un. 17 Power Loom Weaver, Born Dundee
Janet Jackson dau. 14 Scholar Born Dundee
Janet Chalmers Lodger 20 Power Loom Weaver, Born Dundee
Had a quick look at 1861 Census for Queen Street, but the Crichtons don't appear to be there at that time. Sorry, but couldn't go through the whole Dundee Census
Hope you have some luck in finding them soon. They do not appear to be on the 1871 Scottish Census.
Cheers, Dorothy