There are no easy answers and everyone I know in this situation is at their breaking point. It's hard on a man when there is just nothing happening, it becomes a big chore just to stay motivated. "Hang in there" isn't enough most days - you need the hard stuff of finding work and earning a living.
Believe me, it's just as difficult for me to offer advice to you man. It's like, what do I know? I'm not in your situation and I don't have a freakin clue what you're going through. Sometimes I question whether or not it's a good idea to even offer advice and pep talks. Saying "I've been there too" doesn't mean shit, really (even though I have).
The only thing I can say is, your family needs you and what you can provide. You are still the husband and father and, no matter the job situation, that won't change.
I'll also make this one small suggestion. The internet can be fun, and often we get to talk to some folks who can pick us up when we're down, but it can also be a lonely, depressing freakin place at times. It's easy to sit and sit and sit and before you know it, things have passed us by. The kids and wife and LIFE need us to ENGAGE. I see so many people walking around these days, especially kids, who can go an entire day without even taking their eyes off a screen. It makes me sick. My advice would be to talk to people, face to face, not just searching online endlessly, go talk to some places you're interested in working, stop by a golf course, "are you guys looking for someone", anything to mix it up and get your mind offline for a while and begin to appreciate the stuff we do have, like your family, and just LIVE and ENJOY the time you're spending before things turn around for you man.