Donna, thank you so much for the MI.
My understanding is that a Eunice Briggs married a John Rigg at Malew on 6th Jan 1811. They had several children but among them was a daughter Eunice who was baptised at Malew on 23rd Jul 1820. I think this must be the grand-daughter referred to in the MI as the aged 2 years appears to fit although the name should have been Eunice Rigg rather than Eunice Brigg. There appears to be similar confusions in references to the other children with Rigg becoming Riggs or Rigs possibly because the mother’s name was Briggs. Anyway, the information you have provided is a real bonus. It would be wonderful if something similar turned up for the Rigg family. Thank you again. Jenet