A Lamb mystery?

[Helina]

Hope everyone had a good Christmas.
Would like to know how to solve this mystery or how to go about it.
Thomas Andrew Edward Hale born 1899 Bell Hill Lydbrook, parents William Hale 1852-1934 and Teresa Bennett 1859-1901 both born in Lydbrook, William remarried in 1902 to Mary Cole.
Thomas had 5 siblings
William John 1888-1888
Eva Anne 1889-1904
Katherine Teresa 1891-1892
Charlotte Mary 1893-1954
Agnes Lily 1897-1982
Going back to Thomas
Thomas married Gwendoline Audrey Lydia Morgan in 1933  Berkshire, Gwendoline was born in Cardiff 1900-1979,  both Gwendoline and Thomas died in Wales, Glamorganshire. in the 1939 reg both where living in Chipping Sodbury, Thomas's occupation Aircraft Fitter Assembler. They had a son called Norman Andrew Edward .
Now the mystery or have I the wrong family?  When Thomas married Gwendoline in 1933 his surname was altered to Lamb, his son's surname also was Lamb.
Any advice would be grateful

helina

[heywood]

A published tree (with photo) says that he was adopted by his mother’s cousin, Edward Lamb in 1903.

There is this entry for 1911 - at boarding school
https://www.familysearch.org/ark:/61903/1:1:X71T-M5N

[Helina]

Thank you Heywood, that's interesting it certainly explains the surname Lamb

helina