For starters

One clue is the witness : William WHITE who is a witness at the marriage of Esther STIBBS to Alexander SHEPHERD - 22 December 1832 in Lydney, the other witness is Elisabeth JONES.

Hester/Esther's sister: Sarah STIBBS = christened - Monmouth - 1813

married George SHEPHERD - at Lydney - 22 August 1840 - and her father James STUBBS occupation Navigator

George & Sarah SHEPHERD on the 1871 census Lydney