Do you think these are all the same family. I can't find a record of marriage of Thomas and Isabella, various spellings doesn't help

IGI has Thomas Galleitch and Christina/Christian Johnston
children
W._W Galleitch
Robert

1841 Carsgo, Thurso
Thomas Golitch 45 Ag Lab & Miller born England
Christiana 40
Robert 9
Margaret 11 born England
William 3
Georgeina 2m

Christina Gallach d in Angus 1849

1851 Dale, Halkirk
Thomas Galeech Head 55 Miller England - Liverpool
Isabella Wife 33 Midlothian - Edinburgh
Willm Son 13 Scholar Thurso
Georgeina Dau 10 Scholar Thurso
Elizabeth Munro Stpdau 10 Scholar Westerdale

1861 Dale, Halkirk
Isabella Galeach Head 46 Farm Servant Midlothian - Edinburgh City
Elisabeth Munro Dau 20 Farm Servant Halkirk
Christina Galeach Dau 8 Halkirk
Thomas Galeach Son 7 Halkirk
Isabella Munro Dau 3 Halkirk

Georgeina Gouleitch age 20 b Thurso is a dairymaid at Ha of Durran, Olrig

1871 Achalure Halkirk
Elisabeth Munro Head 29 General Servant Domestic Halkirk
David Munro Son 7 Scholar Watten
Alexander Munro Son 4 Halkirk
Donald Munro Son 1 Halkirk
John Munro Son 1 Halkirk
Christina Golliech Sister 18 Farm Servant (Out Of Employ) Halkirk
James Golliech Son 1 Halkirk
Thomas Golliech Brothr 16 Shepherd Halkirk
Isabella Golliech Mother 50 Pauper Edinburgh mother of Elisabeth Munro

1881 Halkirk, with McLeod family
Bell Golitch Ma-Law 68 Pauper Midlothian - Edin
Christina Grndau 6 Scholar Caithness - Halkirk

William Waters m Christina Golitch in Olrig in 1879