I presume this is Ronald who Wynford mentioned earlier today
"Bernice Phillips was my wife's grandmother, her father was Ronald Partridge":

Surname Given Name Mother District Volume Page Transcriber
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Births Jun 1921
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PARTRIDGE Kenneth R Phillips Monmouth 11a 36 DavidH

Yes, from this FoD PRs site;

Record_ID: 1040863
Entry_Number: 71
Year: 1921
Month: Apr
Day: 8
Parents_Surname: PARTRIDGE
Child_Forenames: Kenneth Richard
Fathers_Forenames: Harry
Mothers_Forenames: Bernice
Mothers_Surname:
Residence: Oldcroft
Occupation: Miner
Officiating_Minister: G.A[nderson]
Event: Baptism
Memoranda: [Born] 1921 March 18
Notes:
Register_Reference: 259843
Page_Number: 15
Parish_Chapel: Pillowell Methodist
Soundex: P636

Record ID 1040861
Entry Number 60
Year 1921
Month Apr
Day 8
Parents Surname PARTRIDGE
Child Forenames Kenneth Richard
Fathers Forenames Harry
Mothers Forenames Bernice
Mothers Surname
Residence Oldcroft
Occupation Turner
Officiating Minister G.A[nderson]
Event Baptism
Memoranda [Born] March 18th 1921
Notes
Register Reference 259843
Page Number 12
Parish Chapel Pillowell Methodist

I cannot find any siblings on FoD PRs.

Are these Births related, from FreeBMD ??
(I cannot see a Partridge/Phillips prior Marriage in MT area)

Surname First name(s) Mother District Vol Page
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Births Sep 1922 (>99%)
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Partridge Ronald Phillips Merthyr T. 11a 1440

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Births Mar 1925 (>99%)
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Partridge Dorothy M Phillips Merthyr T. 11a 1311

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Births Dec 1927 (>99%)
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Partridge Betty Phillips Merthyr T. 11a 1027

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Births Jun 1930 (>99%)
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Partridge Raymond Phillips Merthyr T. 11a 1076

A POSSIBLE marriage, perhaps ?(there are others) for Kenneth;

Marriages Dec 1943 (>99%)
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Partridge Kenneth R Bartlett E.Glamorgan 11a 1634

Their possible offspring;

Births Dec 1948 (>99%)
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Partridge Jean D Bartlett E.Glamorgan 8b 395

(Wnyford's good lady perhaps?)

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Births Jun 1954 (>99%)
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Partridge Richard E Bartlett E. Glamorgan 8b 375