As well as marrying Elizabeth Mathew was also married to Ann Leonard. She died in 1771 presumably from complications arising from childbirth as the child also died at the same time. There was one son survived from that marriage, John Siggs, he has many descendants ! Most spellings I've seen of Mathew's name use the single t. His son, James Whiffing Siggs, had 5 children who were baptised Elizabeth 1804, Mary Ann 1805, James Cracherode 1806, Charles Matthew 1808 and John Whiffing 1811. Elizabeth married someone with the surname Richmond and had 5 children before dying at the age of 34. Charles Matthew Siggs had a number of children by 2 different women, 8 by his second 'marriage' ( I don't think he married his second wife) one of which is my ancestor and 4 from his first marriage ( a school teacher who moved to York and took her children with her)