William married Helen Niel on 2 Apr 1820. Helen (daughter of George Neil and Helen Swan) was born in 1796 in Scotland; was christened on 1 May 1796 in Tranent Parish Church, Tranent, Haddingtonshire (East Lothian), Scotland; died after 1871. [Group Sheet]

1. William Swan was born on 23 Feb 1820 in Edinburgh, Midlothian (or Edinburghshire), Scotland; was christened on 2 Apr 1820 in Tranent, Haddingtonshire (East Lothian), Scotland; and died.
2. Helen Swan was born on 27 Mar 1825 in Edinburgh, Midlothian (or Edinburghshire), Scotland; was christened on 26 Apr 1825 in Canongate Church, Canongate, Edinburgh, Midlothian (or Edinburghshire), Scotland; and died.
3. John Swan was born in 1830 in Southwark, Surrey, England; was christened on 7 Mar 1830 in St Saviour's Church, Southwark, Surrey, England; and died.
4. Agnes Swan was born on 26 May 1832 in Brighton Street, St Pancras, Middlesex, England; was christened on 3 Feb 1833 in St Pancras Old Church, St Pancras, Middlesex, England; died in 1904.
5. George Swan was born in 1839 in St Pancras, Middlesex, England; and died.