User blog comment:Stabber ApSig/Mass Relays Gone, ME3 ending/@comment-84391-20120313140831/@comment-5503561-20120313185904

Liara's father? If you're basing that on that one blurry LotSB footage in which most likely Bioware couldn't be assed to put a different picture in the frame, I'm not really inclined to believe that part.

As for creating the new relays, well, with Thessia in ruins and their beacon probably demolished too, with no fast way to get there, and Javik not being the tech-head, I doubt they could rebuild the relay network. Even if they constructed one, they'd still need to make other ones in different systems. And this would mean transporting them there, which once again would take centuries.