William Stewart Jamieson and Elizabeth Lindsay Married IN Launceston on 8 May 1837

I am looking for descendants of these two people. Jamieson may have been a convict arriving in 1821 and given a ticket of leave in 1832. Elizabeth arrived free in 1836 on the Amelia Thompson with her sister, Mary Jane. They may have had six children but I only have the name of Margaret born 1841 and Francis born 1844, both in Hobart.