Hi Shirley, Mary is the sixth child of John and Clarisa born 21 August 1808 and baptised in the New Salem Reformed Church, Albany County, New York. John and Clarisa also had: Albert Elizabeth b 6 August 1801 m Jacob Martin Edward b 23 March 1802 Joseph (?) b 13 Feb 1804 Peter b 7 June 1806 married Anna Smith Alexander b 19 Feb 1811 John Jr. b 23 July 1814 Jane b 17 July 1819
John Sr. is the son of Joseph Stalker and Hannah Albrecht/Albright.
You can find this tree on Rootsweb World Connect.Look for the Stalker tree by Stalk3.Bruce Ackerman is researching this line of Stalkers.