I have found a marriage for David Gash and Elizabeth Graaves (or Greaves) from Sculcoates Yorkshire. The mmarriage took place in Kirton Lincolnshire. - Parish records and census records
The 10 children I have found are not all the same as the ones that you list. Again this is from Lincolnshire parish baptism records and census.
There are several people called David Gash at around the same time. Each generation had sons called David, John or William. At anyone time there are cousins, uncles of father s and sons with the same name
