Since we all seemed to be afraid that wife & child WOULD have been killed, I'm going to the Dark Side and playing the part of the Devil's Advocate:
Is it possible that Huck's family was kept alive as an insurance policy?
We've seen that Huck, Charlie (baseball cap) and Jake are all connected to Mysterious Black Man on the Park Bench. If Charlie (who was supposed to kill Huck but didn't) knows where he's been all this time, then it's reasonable to assume that someone else knows too. They (the BAD guys) may be saving what Huck loves most to use against him at a later date.
Huck probably didn't go looking for them (not actively anyway) because it would have put them in more danger.