Grandpa Joe and his Grandson Tom have bought a barn for their farm, and they should probably get out more, because they're way too excited about the whole thing. In particular, they're excited by the idea that they might one day be able to afford to buy a tractor, which will be a monumental day and something they have so far only dared to dream about.
When you were a youngster and you chewed with your mouth open, or put your elbows on the table, or purposefully tossed your plate of food up onto the ceiling, your mother probably exclaimed, "What, were you raised in a barn?" The implication is that barns are filthy places where animals do their filthy animal things, but Barn Yarn, a simulation game for the PC, seeks to bring an end to the myth that humans can't live comfortably and neatly inside a barn.