all from familysearch, which you may have already
david Jenkins buried 17 march 1840 llanfihangel ar arth birth abt 1773
john Jenkins in 1841 census llanf. ar arth birth 1766 but ages are rounded down on this census
henry Jenkins born abt 1748 lenegwyn buried at llanf. ar arth 12 may 1820
familysearc give no more details but images are available on findmy past, henrys birth may give both parents if you think these are yours
mike