His daughter, Evette San, takes care of him. Critical of his age, he drinks and gambles heavily. Due to his gambling problems, he has accumulated a large sum of debt, and if the Dragonborn helps pay off his debt he offers Two-Handed training. If a dragon attacks he might die.
Octieve San is a Breton, while Evette San, Octieve San's daughter, is a Nord. The only explanation for this can be that Evette's mother and Octieve's wife was a Nord, or Octieve is not her biological father.
If you kill Evette San, then it is likely that he will send hired thugs to kill you.
Should Octieve die after being helped, he will leave an inheritance of 100 septims.
If you settle his debts, he can trigger a marriage dialogue option.