This is what I have for this Joseph P Plant, his siblings and children. See what you think, I may be completely wrong - it wouldn't be the first time, as you know!

:
Descendants of Peter Plant
Generation No. 1
1. PETER4 PLANT (JOSEPH3, JOHN2, JAMES1) was born 1816 in Brierley Hill, Staffordshire, and died Jan 1861 in Brettell Lane, Brierley Hill, Staffordshire. He married MARY PENN 09 Feb 1843 in St Peter's church, Wolverhampton, daughter of THOMAS PENN. She was born 1823 in Brettell Lane, Brierley Hill, Staffs, and died Abt. 1861.
Children of PETER PLANT and MARY PENN are:
2. i. JOSEPH PENN5 PLANT, b. 07 Feb 1843, Rock's Hill, Brierley Hill, Staffordshire; d. 1895.
3. ii. ELLEN PLANT, b. 07 Oct 1845, Rock's Hill, Brierley Hill, Staffs.
4. iii. MARGARET PLANT, b. 1847, Kingswinford, Staffordshire.
5. iv. MARY ANN PLANT, b. 31 Dec 1848, Rock's Hill, Brierley Hill, Staffs.
v. PETER PLANT, b. 11 Feb 1850, Rock's Hill, Brierley Hill, Staffs; d. Abt. 28 Feb 1853, Brettell Lane, Brierley Hill, Staffs.
6. vi. THOMAS PLANT, b. 11 Dec 1851, Rock's Hill, Brierley Hill, Staffs.
vii. SARAH JANE PLANT, b. 22 Mar 1853, Brettell Lane, Brierley Hill, Staffs; d. Feb 1854, Brettell Lane, Brierley Hill, Staffs.
7. viii. PETER PLANT, b. 01 Jan 1855, Rock's Hill, Brierley Hill, Staffs; d. Bef. 1891.
8. ix. JOHN BOLTON PLANT, b. Abt. Oct 1856, The Delph, Brierley Hill, Staffs.
x. SARAH PLANT, b. 12 May 1859, Rock's Hill, Brierley Hill, Staffs.
Generation No. 2
2. JOSEPH PENN5 PLANT (PETER4, JOSEPH3, JOHN2, JAMES1) was born 07 Feb 1843 in Rock's Hill, Brierley Hill, Staffordshire, and died 1895. He married MARY ELIZABETH LONG Abt. Jan 1872 in St James's church, Dudley, Worcestershire, daughter of JOHN LONG and MARY HALE. She was born 1850 in Kingswinford, Staffordshire.
Notes for JOSEPH PENN PLANT:
Or possibly Joseph
Pinson Plant?
Children of JOSEPH PLANT and MARY LONG are:
i. SARAH ANN6 PLANT, b. 1871, Amblecote, Staffordshire; m. WALTER WILLIAM LONGMORE, 27 Dec 1891, Brierley Hill chapel, Staffs; b. 1869, Brockmoor, Staffs.
ii. SAMUEL ALFRED PLANT, b. 1873, Brierley Hill, Staffordshire; m. SARAH L; b. 1873, Brierley Hill, Staffs.
iii. GERTRUDE PLANT, b. 1875, Kingswinford, Staffordshire.
iv. ADA PLANT, b. 1877, Kingswinford, Staffordshire.
v. ERNEST PLANT, b. 1878, Kingswinford, Staffordshire.
vi. HENRY PLANT, b. 1880, Kingswinford, Staffordshire.
vii. GEORGE E PLANT, b. Feb 1881, Kingswinford, Staffordshire.
viii. THOMAS PLANT, b. 1882, Brierley Hill, Staffordshire.
ix. MARGARET PLANT, b. 1885, Brierley Hill, Staffordshire.
x. FRANK PLANT, b. 1887, Brierley Hill, Staffordshire.
xi. JOSEPH PENN PLANT, b. 1889, Brierley Hill, Staffordshire.
xii. MARY ELLEN PLANT, b. 1896, Brierley Hill, Staffordshire.
3. ELLEN5 PLANT (PETER4, JOSEPH3, JOHN2, JAMES1) was born 07 Oct 1845 in Rock's Hill, Brierley Hill, Staffs. She married WILLIAM WHITE 24 Jul 1865 in St Thomas' church, Dudley, Worcs. He was born Abt. 1845 in Brettell Lane, Brierley Hill, Staffs.
Children of ELLEN PLANT and WILLIAM WHITE are:
i. JOSEPH H6 WHITE, b. 1866, Brettell Lane, Brierley Hill, Staffs; m. EMMA; b. 1866, Lye, Stourbridge, Worcs.
ii. JOHN T WHITE, b. 1869, Princes End, Tipton, Staffs.
iii. MARY E WHITE, b. 1870, Princes End, Tipton, Staffs.
iv. MARY A WHITE, b. 1872, Tipton, Staffs.
v. GERTRUDE WHITE, b. 1874, Tipton, Staffs.
vi. WILLIAM WHITE, b. 1876, Tipton, Staffs.
vii. JANE WHITE, b. 1880, Tipton, Staffs.
viii. GEORGE WHITE, b. 1884, Tipton, Staffs.
ix. LILY WHITE, b. 1888, Tipton, Staffs.
x. DAISY WHITE, b. 1891, Deepfields, Staffs.
4. MARGARET5 PLANT (PETER4, JOSEPH3, JOHN2, JAMES1) was born 1847 in Kingswinford, Staffordshire. She married SAMUEL LONG 1866 in St James's church, Dudley, Worcestershire. He was born Abt. 1846 in Brierley Hill, Staffordshire.
Children of MARGARET PLANT and SAMUEL LONG are:
i. ALICE6 LONG, b. Abt. 1869, Brettell Lane, Brierley Hill, Staffs.
ii. ARTHUR LONG, b. Abt. 1872, Carnforth, Lancashire.
iii. SARAH LONG, b. Abt. 1877, Ulverston, Lancashire.
iv. MARGARET LONG, b. Abt. 1879, Ulverston, Lancashire.
v. THOMAS LONG, b. 1881, Ulverston, Lancashire.
5. MARY ANN5 PLANT (PETER4, JOSEPH3, JOHN2, JAMES1) was born 31 Dec 1848 in Rock's Hill, Brierley Hill, Staffs. She married ABSALOM THRUPP 23 Aug 1868 in St John's church, Brockmoor, Staffs. He was born 1843 in Droitwich, Worcs.
Children of MARY PLANT and ABSALOM THRUPP are:
i. WALTER6 THRUPP, b. 1873, Amblecote, Staffs.
ii. THOMAS THRUPP, b. 1875, Amblecote, Staffs.
iii. ALICE THRUPP, b. 1878, Amblecote, Staffs.
iv. HENRY THRUPP, b. 1883, Amblecote, Staffs.
v. JAMES WILLIAM THRUPP, b. 1886, Amblecote, Staffs.
vi. EDWARD THRUPP, b. 1889, Lye, Stourbridge, Worcs.
vii. GEORGE THRUPP, b. 1892, Lye, Stourbridge, Worcs.
6. THOMAS5 PLANT (PETER4, JOSEPH3, JOHN2, JAMES1) was born 11 Dec 1851 in Rock's Hill, Brierley Hill, Staffs. He married LUCY PLANT 09 May 1875 in St Thomas' church, Dudley, Worcs, daughter of JOSEPH PLANT and ELIZA FRYER. She was born Abt. 1851 in Kingswinford, Staffordshire.
Notes for LUCY PLANT:
Perhaps the daughter of Joseph Plant / Eliza Fryer, of the James / Lucy Plant line?
Children of THOMAS PLANT and LUCY PLANT are:
i. SARAH6 PLANT, b. 1877, The Delph, Brierley Hill, Staffs.
ii. LUCY PLANT, b. 1880, The Delph, Brierley Hill, Staffs.
iii. MARGARET PLANT, b. 1883, The Delph, Brierley Hill, Staffs.
7. PETER5 PLANT (PETER4, JOSEPH3, JOHN2, JAMES1) was born 01 Jan 1855 in Rock's Hill, Brierley Hill, Staffs, and died Bef. 1891. He married ROSE HANNAH BENNETT 13 Nov 1876 in Old Swinford, Worcs. She was born Abt. 1857 in Kingswinford, Staffs.
Children of PETER PLANT and ROSE BENNETT are:
i. PETER6 PLANT, b. 1877, Brettell Lane, Brierley Hill, Staffs.
ii. ANN PLANT, b. Abt. 1879, Kingswinford, Staffs.
iii. JOSEPH PLANT, b. Aug 1880, Brettell Lane, Brierley Hill, Staffs.
8. JOHN BOLTON5 PLANT (PETER4, JOSEPH3, JOHN2, JAMES1) was born Abt. Oct 1856 in The Delph, Brierley Hill, Staffs. He married CATHERINE. She was born Abt. 1858 in Brierley Hill, Staffs.
Children of JOHN PLANT and CATHERINE are:
i. FLORENCE6 PLANT, b. Abt. 1880, Brierley Hill, Staffs.
ii. FLORENCE PLANT, b. 1890, Lye, Stourbridge, Worcs.