They set fire to the house.

Heaven send that the reek choked them before the fire touched them! They lie yonder beneath the funeral pyre--our venerable sire and my bonny, laughing babe!" He stopped short, choked by a sudden rush of tears; and Humphrey, flinging down his spade, threw himself along the ground in a paroxysm of unspeakable anguish, choking sobs breaking from him, the unaccustomed tears raining down his cheeks.
The brothers wept together.

Perhaps those tears saved Charles from some severe fever of the brain.

He wept till he was perfectly exhausted, and at last his condition of prostration so far aroused Humphrey that he was forced into action.
He half lifted, half dragged his brother into one of the empty barns, where he laid him down upon some straw.

He rolled up his own coat for a pillow, and after hastily finishing the filling in of the grave, he went back into the forest for his game bag, and having kindled a fire, cooked some of the meat, and forced his brother to eat and drink.