James GUEST has a son, James Jnr, not shown on BCC:
GUEST, JAMES GARRATT
GRO Reference: 1864 J Quarter in DUDLEY Volume 06C Page 123
Certificate: B/1864/Dudley/No. 52 - reg 16th April 1864.
Birth on 6th April 1864 at Netherton Hill Dudley of James, son of James Guest, Nailer, and Sarah Guest, formerly Garratt. The informant was Sarah Guest, Mother, of Netherton Hill, Dudley (mark X).
James Jnr is on the 1881 Census living with his parents:
RG11/2881/?/38/Sch193 - Roundsfold, Netherton
James GUEST Head M 68 Horse Nail Maker
Sarah Do. Wife M 63
Elizabeth Do. Dau U 29 Nail Maker
James Do. Son U 17 Labourer
George FELLOWS Lodger M 27 Coal Miner
Ann Do. Wife M 26
All born Netherton
James Jnr marries in 1883:
Certificate: M/1883/St Saviour's Church Dudley/No 388
Marriage on 25 December 1883 of James GUEST, 19, Bachelor, Galvanizer of Dudley and Martha Ruth Stephens, 20, Spinster of Dudley.
Fathers: James Guest, Horse Nail Forger, and Joseph Stephens, Retort Builder.
Witnesses: Henry Stephens and Elizabeth Guest.
Sadly, Martha Ruth Guest died on 26 March 1886.
James Jnr remarries in 1889:
FreeBMD: M/1889/MAR/Dudley6c/90
Certificate: M/1889/Reddall Hill Parish Church/No. 233
Marriage on 18 March 1889 of James Guest, 25, Widower, Galvanizer of Cradley Heath and Harriet Heathcock, 20, Spinster of Cradley Heath.
Fathers: James Guest, Horse Nail Maker, and Ambrose Heathcock, Chain Maker.
Witnesses: Thomas Hingley Parsons and Elizabeth Cole.
James Jnr and Harriet were living with Ambrose at the time of the 1891 Census, as already shown on BCC:
1891 Census Waste Lye Stourbridge Worcs
Ambrose Heathcock Head 61 Grocer
Mercy Heathcock wife 59
Esau Heathcock son 22 Iron Plater Worker
James Guest lodger 27 Galvaniser born Staffs.
Harriett Guest wife 20 Scholar
Anne Guest dau 3
Isaac B. Guest son 1
Rest born Lye Worcs.
I hope that this establishes the connection!