Dear Nancy, My Penman links come from Essex/Kent. Maria Matilda Penman was born abt 1829 in Kent and married William Henry Downer (b 1820) at St. Anne's Limehouse in 1845. They migrated to Tasmania, then to Melbourne where Maria died in 1876 at Emerald Hill. Maria's father was George Penman (believed to be a Pilot) who married Matilda (Unknown)
Suspect this is part of your family line, but we have no further details of Maria's siblings, or forebears. Do you recognise any of the above?