Alice White Senior b 1791 (1871 census) was the mother of Issac White, Alice White junior b 1837, Grandaughter to head George White on the 1751 census, his wife Alice (mother of Issac) may have been staying elsewhere on the census night. By 1871 looks like George had died leaving his son as head of the unit. The 1841 census would tell you more about Alice juniors parents