It looks like a different line. With a little more info we should be able to fill in the branch for you.....

Name: Alfred William Roberts
Year of Registration: 1907
Quarter of Registration: Oct-Nov-Dec
District: Westbury On Severn
County: Gloucestershire
Volume: 6a
Page: 275

1911
ROBERTS ALFRED M 1908 3 Westbury on Severn Gloucestershire

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Name: Alfred W Roberts
Death Registration Month/Year: 1946
Age at death (estimated): 38
Registration district: Forest of Dean
Inferred County: Gloucestershire
Volume: 7b
Page: 311

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Name: Catherine I Jones
Name: Alfred W Roberts
Date of Registration: Oct-Nov-Dec 1935
Registration district: Westbury-On-Severn
Registration county (inferred): Gloucestershire
Volume Number: 6a
Page Number: 659

possible children

Name: William G Roberts
Mother's Maiden Surname: Jones
Date of Registration: Oct Nov Dec 1943
Registration district: F of Dean
Registration county: Gloucestershire, Shropshire, Herefordshire
Volume Number: 6a
Page Number: 495

Pearl J Roberts Apr May Jun 1939 F of Dean Gloucestershire, Shropshire, Herefordshire
Alfred I Roberts Jul Aug Sep 1941 F of Dean Gloucestershire, Shropshire, Herefordshire
Oliver J Roberts Apr May Jun 1947 F of Dean Gloucestershire