James Mangnall was born in 1736 to James Mangnall (MM017) and Esther (nee Briscoe) (MM018). He married Richmal Kay (LM023) on the 29th September 1763 at the church of St Mary, St Denys and St George (now Manchester Cathedral) and they had the following children:
- Sarah (KM030), born 1764 ;
- James (KM031), born 1766, died 1829;
- Richmal (KM032), born 7th March 1769, died 1st May 1820;
- Mary (KM033), born 1772, died 1845, married Mr Tait;
- Eliza (KM034), born 1774;
- Matilda (JM058), born 1775;
- Kay (JM059), born 1778, died 1801.
James died in 1784.