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Forget the 1891 census suggestion in my last message. Having found Kathleen’s marriage details, I see that John William Gregg MacGregor was a Clerk in Orders (so presumably a Doctor of Divinity ?)
Marriage of Elaine Kathleen Nora Gregg-MacGregor:

www.familysearch.org/ark:/61903/3:1:S3HY-6GFS-13P?i=82&cc=1784428

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You’ve probably got all the following census info ?

1901
Claremont, Bay View, Ramsey (private school)

Elaine G MacGregor 19 student b England (can’t decipher the other word---looks like Warleggan)

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1901
32 Derby Square, Douglas

Ancestry’s transcription:

Name Age
Rosanna S Gregg Mar Geron 48
Fanny E Gregg Mar Geron 21

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1891
The Haven, Burnham, Somerset
Ancestry’s mistranscription:
Name Age
John W Gregg 54
Rosanna Gregg 40
Fanny E R Gregg 4
Elaine K N Gregg 9
Winifred H M Gregg 7

notes:
JWG Clerk in Holy Orders b Ireland
RG b Ireland
FERG 14 (not 4) b Allenhall, Gloucester
2 youngest b Cornwall Warlegan

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1911

Ancestry’s transcription:
Name Age
Rosanna Sarah Gregg MacGregor 58
John Vyvyan Frotescue Gregg MacGregor 35
Fanny Ethel Rose Gregg MacGregor 33
Elaine Kathleen Norah Nathanielsz 29
Winifred Muriel Hilda Gregg MacGregor 26
Arthur Holman Nathanielsz 33
Esmie Norah Gregg Nathanielsz 1
Sophy Harny 30

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Jean C