This site might help
http://boards.ancestry.com/mbexec/message/an/surnames.porter...
In case you can't find it
This is what it says:
* Peter (The Emmigrant) Porter b. abt 1605 England
m. Frances (Dorsey?) b. abt 1605
* Peter Porter II b. abt 1651 d. 1676
m. Sarah Howard b. abt 1662
* Peter Porter III b. abt 1674 d. aft 1750
m. Lois Shipley b. abt 1674
[d/o Adam Shipley b. abt 1654, and Lois _]
* Peter Porter IV b. abt 1704 d. aft Jun 2 1774
m. Ms Shipley? b. abt 1704
* Adam Porter
b. abt 1742 prob Ellicott City MD
d. aft Dec 8 1823 prob Bath Co VA
m. Delilah Ann Tevis abt 1766
b. abt 1742 prob Anne Arundel Co MD
[d/o Robert Tevis b. abt 1772]
* Ann Porter b. Oct 5 1767
* Robert Peter Porter b. Mar 13 1768
* Pegga Porter b. Jan 23 1772
m. John McDannald Jr Jan 1 1801, b. abt 1772
[s/o John McDannald Sr]
John and Pegga moved to Blendon Twp, Franklin Co OH
* Joshua Porter b. Oct 10 1772
* Mary Porter
b. Oct 10 1772 Ellicott City MD
d. aft 1852 prob Alleghany or Bath Co VA
m. John Simpson Apr 9 1805 Ft. Dickinson, Bath Co VA
b. abt 1774 western PA, d. abt Sep 1850 Alleghany Co VA
Descendants of Mary Porter and John Simpson
* Emelia Porter b. Nov 28 1774
m. Nimrod Boggess Feb 7 1801, b. abt 1774
* Adam Porter b. Oct 20 1776
* Peter Porter b. Jul 20 1778
m. prob Anna Hopkins b. abt 1778
[d/o William Hopkins b. abt 1758, and Mary _]
* Benjamin Porter b. Oct 14 1779 moved to Lincoln Co TN
* Ruth Porter b. Jul 5 1784 d. bef 1792 Augusta Co VA
* John Porter b. Dec 27 1787
* Nancy Porter b. abt 1789
m. John Gillaspie Jan 8 1808, b. abt 1789


Contributor: Betty Simpson
Email: BSimp19525@aol.com

Hope this helps.