So there's three towns now (since about 1040, really). Botnborg, Nyhöfn and Wampanoagborg. All small towns still.
But compared to much of modern Sweden at the time these would together not be an inconsequential region.
Botnborg and Nyhöfn are both coastal towns, is Wampanoagborg coastal too?
How old is Snorri now? Late 70s? He's been Jarl from the 1030s at least. His eldest son ought to have grown kids of his own by now.
Integrating into the local tribal structure makes sense, as Driftless said. I'm thinking that since the tribe probably runs on traditional rights and obligations, some deviations from the norm for this new sub-tribe would be justified by the way they've entered the tribe slowly over decades while keeping their own identity.
Snorri Thorfinnsson is 75 right now. He has two children (a son and a daughter). His son is in his 40s and has two sons of his own. Snorri's daughter has one son.
Wampanoagborg is located in the interior as a more central location for tribes to meet.