20 million borrowed from the bank- to buy out the old man by the kids I bet. And it sounds like only one of the three kids knows what's going on. That's going to be tough to make it.
Really it looks like pretty new equipment to me, that they've just been running into the ground. The dozers/ fuel truck and everything else looks pretty new. As long as they keep paying you, I don't see any reason to stop working for them. It will take them a while to run out of the founder's money.
Give them about 3 years and the kids will see how much work it took for the founder to get there, and I bet they will be looking for someone/ competitor to write them a check for the whole thing.
Its just so difficult when the employees know that the boss/ bosses don't have any idea what they are doing, and dad handed it to them. Its a pain for the superintendents and for everyone else down the chain, because there's no one to ask "how do you want to do this?" because the new bosses don't know what they are doing.