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I suspect Oslow is a mistranscription of Horsely / Horsley / 'Orsley. This document is just a transcribed index and we don't know how many generations away from the original records it is.
See image 1164 for source of document

Then that's a relief! I just wonder how someone could mistake Horsley for Oslow.

Edit
Weird for information

There does seem to be another family in the area on the 1861,1871,1881 and 1891 Census 
Samuel Macey
Priscilla Macey
Where born    Fonthill Gifford, Wiltshire, England
Civil parish    Fonthill Gifford
Ecclesiastical parish    Salisbury
County/Island    Wiltshire
Country    England

https://www.ancestry.co.uk/search/collections/6598/records/16987734
https://www.ancestry.co.uk/search/collections/8767/records/23695995
https://www.ancestry.co.uk/search/collections/7619/records/4333860
https://www.ancestry.co.uk/search/collections/7572/records/23282777


Above parents and area mentioned as simpler to below Christening details for reference
Name   Henry Thomas Macey
Sex   Male
Father's Name   Samuel Macey
Father's Sex   Male
Mother's Name   Priscilla
Mother's Sex   Female
Event Type   Christening
Event Date   29 Oct 1854
Event Place   Fonthill Gifford, Wiltshire, England, United Kingdom

Since they had so many children, sometimes the census report for their household would go onto the next page, and not all the time transcribers realize this and put the names on the next page down as a separate household.

This just seems to be a case of transcribers not communicating and making duplicate records. Since I'm around 60% sure ancestry gets half of its record from other places (Like Familysearch or FreeReg) and doesn't bother to check its credibility. There is only ever one Samuel Macey c1831 baptized in Fonthill Gifford.
Samuel on 25 Sep 1831 to James Macey and wife Alice, Fonthill Gifford, Wiltshire.
Samuel Macey and Priscilla Burt 1854 in Tisbury, Wiltshire. (Marriage Registration)
Priscilla on 16 Sep 1832 to William Burt and wife Harriet, Fonthill Gifford, Wiltshire.

Thank you!
1 down, another to go.

I've been entertaining Thomas Henry's in the area now but none of them are matches.

Two siblings:
Henry Thomas Macey b. 1854 Fonthill Gifford
Mary Macey b. 1861 Fonthill Gifford
Born to Samuel Macey and Priscilla Burt.

Henry Macey disappears after the 1871 census, where he is still with his family.
Mary Macey disappears after the 1881 census, where she is a servant for the Smith family in Langton-Matravers, Dorset.

Two of their siblings end up living in Dorset, and one in Somerset. Two immigrated to Canada, but said siblings immigrated between 1900-1910.

Any information about them would be appreciated.

You might not be able to find a marriage between Henry and Alice because it may have been a clandestine marriage or a "fleet marriage." Which was held in secrecy, and many times without a church banns or marriage license. The marriage act of 1753 stopped this from happening frequently.

I find with many of my ancestor who lived before the 1750s have no marriage record. It makes finding a mother's maiden name or who a daughter marries very hard. If they have rare given name, like Frances, Priscilla, or Cornelia, I find baptism records that include a mother's name, and try to track the mother until they die. I usually go off of names, and it helps if someone else in the family also has a rare given name, as then her children may also have the same name. If a burial record with an age can be found, it's even better. Of course I doubt everyone is 100% correct.