That is great news! I second what Mahonri said. Now is the time to save, prep, get your garden going, plant fruit trees. Most people I know that got your good news would run out and buy a new livingroom set.
but I see it as a chance to seriously secure your future, while NOT trying to raise your standard of living. Hard, I know, but the best possible thing you cold do. That is such a relief for you to have job security, not have to move, benefits, WOW! GOOD for you and your family!!!!