From the Glamorgan FHS Transcriptions for Llansamlet
Marriages
Sims, Hopkin of Llansamlet to Thomas, Elizabeth of Llansamlet 8 May, 1802
Sims, Hopkin of Llansamlet and David, Margaret of Llansamlet by Banns, 26 Feb 1814
Note - the initial post has him marrying a Gewnllian Davies on this date? (Gwenllian married Hopkin Sims Junior methinks)
Baptisms
Sims, Hopkin, father Hopkin, collier, mother Margaret - 20 Dec 1814, Pentre Engine Fach
Sims, David, " " " " " - 23 Mar 1817, Pentre Engine Fach
Sims, Anne (twin)" " " " " - 30 Mar 1820, Engine Fach
Sims, Margaret (twin) " " " " - 30 Mar 1820, Engine Fach
Sims, Margaret, father Hopkin, Collier, mother Gwenllian - 30 Nov 1839 Bonymaen
Sims, David, " " Spelter Man, " " - 5 Mar 1842 Bonymaen
Sims, Hopkin, " " Copperman " " - 30 Jan 1844 Bonymaen
Sims, Ellen, " " Collier " " - 6 Apr 1847
Checked for baptism Hopkin Sims Snr b 1777 in Llansamlet and adjoining Parishes (Llangyfelach, Neath, Cadoxton,St Mary's Swansea) but drew a blank.
regards