In the baptism record his mother's surname is wrong. She was Anne Torgrimsdatter.
Siblings: https://familysearch.org/search/records/index#count=20&query=%2Bfather_givenname%3Ajørgen~%20%2Bfather_surname%3Asvennungsen~%20%2Bmother_givenname%3Aanne~%20%2Bbatch_number%3AC42560-2 Erik 1818, Jørgen 1820, Ole 1826 and Halvor 1829.
Using tax payers list I found 39 Hauglands in Bø today, also the names Erik, Eirik, Kittil and Knut. I guess they are descendants of Erik Jørgensen and Jørgen Svennungsen. Use the phone directory and make them a call: http://www.gulesider.no/person/resultat/Haugland,%20Bøhttp://www.gulesider.no/person/resultat/Haugland,%20Bø