John Stuart Jr. (1912–1997) was one of the heirs of the Quaker Oats Company fortune.
For 20 years, he lived in Peterborough, Ontario, the location of the main Quaker Oats facility in Canada.
On Old Orchard Farm, his estate outside of Peterborough, he raised prize Hereford cattle.
Stuart and his first wife, Nancy (née Whiting, Chicago IL) had two children, Stephanie and John III.
With his second wife, Norma (née Bobcaygeon, Ontario, Canada) he had one daughter, Joan.