Are Lin and Johnny related or what? ***contains spoilers**

Just curious, but are Lin and Johnny related? The reason I ask is, after Lin is killed during the Westside Rollerz missions and right before you and Julius attack the Rollerz convoy, Julius says that Johnny is going to take the news hard. (or maybe he says Donnie, but then again, why would he care if a Roller gets upset over a Saint's death)
I don't remember any conversation linking Lin and Johnny romantically or by being related. Although I can see them being related since both charactes are Asian. Or who knows, Johnny seemed like a ladies man to me, so maybe they dated.
But on that, he seemed more into Aisha.
Does anybody know for sure?

Close only counts with horseshoes, hand grenades, and thermo-nuclear weapons.