Thanks for sharing the info of the 'Time-Line' for what you know of William.
The following may be of use to you, if only to help in eliminating !!!! them ...in the nicest possible sense .
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SUPPOSITIONS BASED ON YOUR INFORMATION + THE IGI LISTING
Mistyrose : Emily Baptised 12/May/1839 Purton Union Wilts [Bap. Reg. No.1373]
WILTSHIRE IGI : Emily / Mary Newman Christening 5/Dec/1852 Edington Wilts
1851 Census : Calne W/H Emily 12 born Purton Wilts cby 1839
The WILTSHIRE IGI shows Emily as the daughter of / Mary Newman. I believe the '/' is usually an indication in the IGI of the Mother being un-married ?. Hopefully the Purton Union is not another W/House ?, though if it is, their records may be more informative than a Parish Register ?
Have you tried to find a certificate for Emily in the BDM Indexes ?
Are there any references to an Emily age 2 in the 1841 Wilts Census ?
SUPPOSITION : Mary, having died 26/May/1852, - approx 7 months previously-, perhaps who-ever took on Emily had her (re-)Christened ? at Edington on 5/Dec/1852 ?
Can you get a look-up for a possible ( adult ? ) Edington Baptism on this date ?.
Mistyrose : Mary died Calne W/H 26/May/1852
1851 Census : Calne W/H Mary 30/38 born Christian Malford Wilts cby 1821
( 2 separate indexes give 2 different ages for Mary - can you see the original film to verify ? )
Can you ask for a look-up for the Christian Malford Parish Registers to check for Marys birth ?
Mistyrose : William Baptised Calne Union Workhouse 5/Nov/1848
1851 Census : Calne W/H William 2 born Bremhill Wilts cby 1849
SUPPOSITION : Perhaps William was 'farmed out' to some-one in Cricklade ? as he was approx 3 years old when his mother died, perhaps he assumed that Cricklade WAS his place of Birth ?.
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SUPPOSITIONS ON A CHRISTIAN MALFORD / BREMHILL / CALNE CONNECTION
Christian Malford is approx 5 miles NW of Bremhill which is approx 2 miles NW of Calne.
There may be a 'trail' from Christian Malford to Bremhill then on to Calne
In the 1851 Census at Bremhill there are 3 separate families whose HEADS are shown as being born in CHRISTIAN MALFORD and who are within 2 folios ( approx 20 houses ) of each other.
BIG supposition ( based on Christian Malford as the birthplace and the approx age ranges ) is that they and Mary are related / siblings
? :
BUT if so, why did they not help her
- possibly the black sheep of the family - un-married with 2 kids
?
Perhaps the Christian Malford PR will help ?.
John 43 ( wife Hannah (nee Boulton ?) b. Christian Malford Film 1837-Folio 026-Sched 017
Thomas 41 ( wife Rebecca (nee Hadrell ?) b. Christian Malford Film 1837-Folio 028-Sched 032
Joseph 35 ( wife Elizabeth (nee Bull ?) b. Christian Malford Film 1837-Folio 028-Sched 038
Also the following is assumed to be the same Joseph( not the Joseph above )
but listed in 2 places ( one place said he was absent )
Joseph ( Absent age not shown ) b. Bremhill Film 1837-Folio 016-Sched 082
Elizabeth ( wife ) 48 b. Broad Hinton Film 1837-Folio 016-Sched 082
THEN AT CALNE
Joseph 60 Married b. Bremhill Film 1837-Folio 117-Sched 055
There were only 4 Newmans in Calne, the other 3, in the W/House, were Mary, Emily, William
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REFERENCE YOUR SUPPOSITION ON WILLIAM b. HIGHWORTH IN THE 1861 CENSUS
The following from the 1851 may 'eliminate' him - sorry ...
Film 1833 Folio 017 / 18 Sched 026 at Highworth
Henry 42 b. Coxwell BRK
Charlotte 43 b. Highworth WIL
William 7 b. Highworth
Elizabeth 5 b. Highworth
John 3 b. Highworth
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Again, I hope I am not confusing the issue with the above. Mick Newman