I'm not sure Igon would know that.
However, they are known to be vassals of the clan Staeld (mostly dead now and their keep obviously in Jarin hands), and the the Staelds fought at Leriel and the Battle of Fjaga.
Update
Actually, it seems you would know this. I just checked and one of your Seld cousins (Eilyn) married the Valhakar Firan Turen a decade or so ago. There was at least one child of the union.
So, in short, they're loyal to the Taareskelds.