Looking for My Murray Connection

Thomas MURRAY, abt 1728, married Mary ------ abt 1749. They had 4 children: John, 1750, William, 1752, Betty, 1753, Mary, 1755. My MURRAY ancestry begins for certain with John MURRAY, born abt 1769. Could he have been a gradnson of Thomas? John married widow Penelope PALLING, nee INMAN, in 1789 in Cannington, Somerset, UK. I really hope to be able to find a date of birth and parents for John MURRAY. He was buried in Cannington on 12 Apr 1848. His second marriage was to widow Elizabeth FURZE, nee BISS, on 30 May 1814. John/Penelope's first child, Ann, born in 1791, Cannington, is my ancestor.