I show Edward Shimmin and Mary Christian with six children (& baptism dates)as follows: Margaret (Oct18,1752),Jane (Jan 5, 1755), John (October 23, 1757), Edward (March 16, 1760), Ann (July 10, 1763), Richard (Jan 14, 1770). Note that in the 1841 census, there is an Edward in Malew aged 80 and a Richard in Rushen aged 70. Richard is living at the same address as Catherine S aged 30 and Mary S aged 35. Note the census asked for ages to be shown in multiples of 5, so 35 would mean between 35 and 39.
May died intestate on or about Augst 10 1790, and Edward and the six children are named in the chapter court document (LDS film number 0106402). Mary was buried Aug 12 1790 in Rushen. A John Shimmin was buried in Rushen on Feb 29, 1832 aged 54, an Edward Shimmin was buried in Rushen on April 6 1843 aged 83, and a Richard Shimmin was buried in Rushen 5 January 1844 aged 75. I have this information as I was trying to trace Mary Christian, but I have no information on her or Edward's parents or grandchildren. Good luck