Most family farms are lost to confiscatory tax loads when the patriarch dies.
That is not true. The inheritance tax is zero. Plus, there are a zillion ways to pass the farm on to the next generation. What you say is a myth.
Farms are lost due to an inability to pay off loans, and occasionally steep medical bills.Also, there are a lot of farm kids who prefer to sell the damn thing and get a decent job in the city. People DO get tired of slopping hogs, feeding chickens, and plowing the back 40, you know. It is always a better pretext to say "The gummint took it" than "the ole man made bad decisions about planting, borrowing or managing the farm".