From 1851, this looks like Esther and John, and daughter Jessie (Janet) and James McGregor:
John Sutherland 69, tailor, b. Parish of Berriedale, Caithness
Esther Sutherland 69, b. Parish of Latheron, Caithness
Anne Sutherland 25, daughter, hemp spinner, b. Parish of Berriedale, Caithness
Also at the same addresss of Knockally (on the same page) are your McGregors:
James McGregor 38, Agricultural Labourer, b. Parish of Latheron, Caithness
Janet McGregor 29, b. Parish of Berriedale, Caithness, as are all the children...
Jane McGregor 13
Isabel McGregor 12
Esther McGregor 9
Charles McGregor 6
Anne McGregor 3
Johanna McGregor 2
Monica