Hello again, Mike!
I found this couple in a book with some farm history for this area [Krossen D.: "Bygdebok for Årdal. Slektsbandet" Årdal Kommune 1985, p. 132, 807, 847]. Here is a summary:
Thomas was born in Hæreid main farm 1807, probably in a holding called Norra where his parents lived as cotters for several years. His father was Peder Simonsen (1776-1847) from Ivarsplassen holding under Hæreid. His mother was Brite Thomasdatter (b.1770) from Nørøyni holding under Øvsttun main farm in Øvre Årdal (means Upper Årdal). You will find this couple in the 1801 census at this URL
http://digitalarkivet.uib.no/cgi-win/webcens.exe?slag=visbase&sidenr=41&filnamn=f11422&gardpostnr=48&personpostnr=1515&merk=1515#ovre
Thomas Pedersen was called "Norrasmeden" which means the blacksmith from Norra. He must have been a clever blacksmith! In 1830 he married Mari Olsdatter (b. 1804). Her parents were Ola Sjursen (1775-1870) and Marita Endresdatter (b.1772) who run Gjelseng holding in Asperheim main farm. You will find this couple in the 1801 census at this URL:
http://digitalarkivet.uib.no/cgi-win/webcens.exe?slag=visbase&sidenr=4&filnamn=f11422&gardpostnr=71&personpostnr=2021&merk=2021#ovre
Thomas and Mari lived at Haugen holding in Asperheim. In fact they were the first settlers here. They got 4 children: Brite (b.1830+), Marita (b.1833), Peder (b.1835) and Ole (b.1837). I must add that Mari had a child from before: Brite (b. 1828). Her father was Thomas Olsen Seim (b.1805). This child was married in Årdal 1850. Mari died when her last child was born.
In 1839 Thomas married Marita Olsdatter [Krossen has 1845, but that must be a misunderstanding]. She was born 1798 as a daughter of Ole Olsen Hæreid (1770-1837) and Brite Mortensdatter Prestegaard (1774-1852) who ran one of the farms at Hæreid [also written Hærøe]. You will find this family in the 1801 census at this URL:
http://digitalarkivet.uib.no/cgi-win/webcens.exe?slag=visbase&sidenr=11&filnamn=f11422&gardpostnr=48&personpostnr=1473&merk=1473#ovre
Thomas got no children with his second wife, but she had a son from an earlier relationship: Thomas (1825-1844). His father was Henrik Endresen Hestetun.
The source here, the Krossen bygdebook has got a lot of information of the ascending lines of this people. They were all members of basic Årdal families. I think you will find much of the key data in the Årdal database. You will find it here:
http://www.sffarkiv.no/fhclub/bygdaard/index.html Be patient loading this database and search with the names of the main farms as surname.
Good luck!
