Old Country Life by Sabine Baring-Gould — Read

One day a very grand and, as she conceived, original idea came into my grandmothers head. She was resolved to represent pictorially, on a sheet of cartridge-paper, all the confluent streams of blood in her children's veins, of the families to which they were entitled to draw blood through past alliances.

So my grandmother got out her ruler and colour-box, and a pallet and brushes, and filled a little glass with water. Presently a pedigree was drawn out by the aid of compasses and a parallel ruler. Then she rubbed her paints and set to work colouring. She dabbed some vermilion on Father A, and gamboge on Mother B; then on the next in the same generation, Father C, she put sage-green; and his wife, Mother D, she indicated with Prussian blue. The son of vermilion A and gamboge B was R. That was simple enough; in his arteries flowed a vivid tide of combined vermilion and gamboge. He married S, who was the offspring of sage-green C and Prussian blue D; consequently her arteries were flowing with rather a dingy mixture of sage-green and Prussian blue. Now R and S had a child, P, and his veins were charged with a combination of vermilion and gamboge and sage-green and Prussian blue.