Robert married May Mary Montgomery before 1806 in Washington Co. Pennsylvania. May (daughter of William Montgomery and Mary Johnston) was born on 28 Dec 1783 in Washington County Pennsylvania; died on 10 Apr 1857 in Clark, Indiana, USA. [Group Sheet] [Family Chart]

1. John McMillen was born on 18 Apr 1806; died on 2 Aug 1889.
2. Rebecca McMillen was born on 15 Mar 1808; died on 16 Feb 1891.
3. William McMillen was born on 10 Oct 1810.
4. Isabella McMillen was born before 1820.
5. Male McMillen was born before 1820.
6. Nancy McMillen was born after 1820.
7. Sarah McMillen was born on 2 Mar 1826.