I am looking for any information on a John Aitken from Edinburgh, abt. 1820's. He married a Baird, daughter of Capt. David Baird. (name may be Jean Baird). They left Scotland abt. 1840, first for Canada and then to Chicago.Son John Aitken, b. 1841, m. Annie Marshall. Their son was John Marshall Aitken, he moved to Washington State in 1871.