You can check for children of Thomas ROBERTS/Elizabeth FROWEN - on FOD records.

This tree is on Public Members Tree on Ancestry (obviously can't say whether the info is 100%) and give children of Thomas Gwilliam ROBERTS and Elizabeth FROWEN as

Thomas Gwilliam ROBERTS - 1792
William - 1795
John - 1798
James - 1806 - 1873 *
Hannah - 1807

and list James as Baptism 19 Jan 1806 Coleford

1850 age 44 - quarryman

1870 - age 64 - residence Monmouth Union Work House

death: Sept 1873, Shropshire/Staffordshire/West Midlands, Worcestershire

and burial

9 September 1873, Coleford

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Thomas ROBERTS,(Quarryman) his wife Mary (nee FRANKLIN) + children and Elizabeth ROBERTS age 72 are on the 1841 census in Newland

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FOD records - Marriage at Awre - 13 July 1815

Thomas ROBERTS - Bachelor, - residence FOD

married

Mary Ann FRANKLYN - Spinster, residence FOD

witnesses: Hanna DAVIE or DAVIS/Thomas DANIEL clerk