Tojued:

Thanks alot
I don't really know much about OINP but since social ties and personal relationships apply, then dad's cousin might work. Worst case scenario they determine that he's not your family, but he still gets classified as social tie/personal relationship. However you could always play safe and use the FSW eligibility list for relatives in Canada as a rule of thumb:

This relative must be a:
parent
grandparent
child
grandchild
child of a parent (sibling)
child of a grandparent (aunt or uncle)
grandchild of a parent (niece or nephew)