Hi Jami, I have a Samuel Smith Mapes, born 1829, who is the father of Joel Alonzo. Samuel's father is also Samuel Smith, born abt 1800. Since Seth is born in 1790 it means he would be only 10 when Samuel was born. Either the dates are wrong or we need to look elsewhere for Samuel's parents. If you have additional information please let me know.
I have published 3 books on the Mapes and issue an annual update on CD. If you are interested in any of these publications let me know and I'll send more information.