The house of Mar the lineage taht started from Mar all the way to Jak(so far). Mar and Jak are related but not the same person.
Wait. I could've swore Jak and Mar were the same person in different time periods.
If I recall correctly, they said that Jak was in fact Mar at the end of Jak III, unless I've got everything mixed up.
All this time travelling stuff makes things pretty confusing, lol