Marvin Perry, VT and PA and descendants

My brick was is Marvin PERRY who was born 1785 in Tinmouth VT,and died 1863 in Venango Co. PA. Am looking for information to tie William L(ayton) PERRY to Marvin as a son and prove that Thomas Lincoln PERRY was the grandson of Marvin.. I believe William to be born 1826 in Venango Co. PA and died 1919 in Venango Co. Wife of William was Eliza KARNES also of Venango Co. Thomas Lincoln PERRY was born 1862 Venenago Co PA and died 1930 Venango Co. PA.