William Blackett married Elizabeth Barber in Deal, Kent in 1762, and the couple had at least seven childen who were baptised in Sandwich and Dover, elsewhere in the county. In the 1870s their great-grandson William Thomas Blackett emigrated to New Zealand. Another great-grandson, Leonard Patterson Norris, emigrated to Victoria, Australia where at least seven of his children were born between 1857 and 1873.
No baptism for the first William Blackett has been found, but he is shown as aged 80 at his burial in 1818, which would put his birth at around 1738. For a descendancy chart of William Blackett and Elizabeth Barber please click here.