In my Ahn file I have a John Ahn, b. 1807, who had a daughter Sarah, b. 1830 and a daughter Margaret, b. 1835. According to the 1850 Census they were living in Birmingham Twp., Delaware Co., PA. Do you think this is the same family? I am not related to him and unfortunately have no other information for you.
My 3rd great grandfather Benjamin Franklin Ahn was born November 19, 1806, died June 02, 1885, married October 17, 1833 Lydia Yarnall Griffith, daughter of Abner and Amy (Garrett) Griffith, born February 14, 1809, died October 24, 1886.