Vernan Mannon had at least one son, Richard.
Richard Mannon and Agnes Smith
Richard was born in 1741 in County Down, Ireland. He married Agnes Smith (1750-1800). They had the following children: Elizabeth (1766-), William (1769-1851), Barbara (1771-1820), Prudence (1775-1829), and James (1781-1873). Richard died in Elizabeth, Pennsylvania in 1812.
Barbara Menown and George Watt
Barbara (1771-1820) married George Watt, a man from County Down, Ireland. This family moved to Ohio.
Biographical information provided by Heather Wylie.