I am not related but from a bit of general searching today
Rev. Moore MORGAN married Margaret CONWAY in 1811
Details of their gravestone in Dunlavin is on a paid site
Moore died Nov 15 1857 aged 80 implies bc1777
Margaret died Jan 30 1862 aged 77 implies bc1785
Baptism of Sarah in 1812 at St George's CoI Dublin
LINKmarried William WATSON Oct 22 1834 Dunlavin
Baptism of William Conway in 1814 at St George's CoI Dublin
LINKOwen Morgan is listed in the 1924 Alumni Dublin Edition as
MORGAN, Owen Pen (Mr. Jamieson) Jul 1 1833 aged 17; s. of Moore Clericus, b. Wicklow
implies b.c.1816 Co. Wicklow
John Morgan is also listed in the 1924 Alumni Dublin Edition as
MORGAN, John Pen (Mr. Lowe) Oct 16 1835; aged 16; s. of Moore Clericus, b. Wicklow; BA Vern 1841; MA Vern 1853; BD and DD Hiem. 1872; Dean of Waterford
implies b.c.1819 Co. Wicklow
Possible son Thomas??
LINKmarried in Cork in 1850;
original not yet available on line
LINKThere is also a college entry for Moore Morgan
MORGAN Moore Nov 2 1795 Pen (Mr. White) aged 16; s. of Lewis defunctus; b. Co. Kildare BA Vern 1800 MA Vern 1814
I wonder if your date of death for Lewis MORGAN as 1821 is correct as Sinann mentioned earlier a death recorded as 1785?! Something to consider
Although there is reference to a headstone for Lewis MORGAN from Jun 16 1821 here
LINK search for Morgan
Of interest if not your posting!
LINK