He was educated at Konghelle (Kungahälla) in  Bohuslän (Båhuslen) which at that time a royal center of the Kingdom of Norway. Jón Loftsson was married to Halldóra Brandsdatter with whom he had several children.
Jón Loftsson studied at Konghelle (Kungahälla) in Bohuslän (Båhuslen), where it was a crucial royal center for the Kingdom of Norway. He then wedded Halldóra Brandsdatter, resulting in several offspring.