van gogh,

Vincent Willem van Gogh was born in Groot-Zundert, a village close to Breda in the Province of North Brabant in the southern Netherlands, the son of Anna Cornelia, nee, Carbentus and Theodorus van Gogh, a minister of the Dutch reformed church. He was given the same name as his grandfather—and a first brother stillborn exactly one year before. Now he was a guy who some may think was mad. Well perhaps he was, and he expressed this in his art. (or did he) He wasn't an imprssionist, but yes he did favour expression, and that of symbolism!
He only ever sold one painting in his lifetime, (The Red Vineyard). What about the colour yellow, its everywhere. There are some interesting theories about his use of yellow.

I found this piece of information to be more significant:

"Following his death, his fame grew slowly, helped by the devoted promotion of it by his widowed sister-in-law."

Arsenic was commonly used in the past as a method of slowly driving someone mad. Heavy metal (or mercury poisoning) was another common method of creating the illusion of madness in a person.

Both chemical poisons build up gradually and slowly in the body, and are not released by normal processes.

Does anyone know if his widowed sister in law happened to have a son?

I acknowledge omgitshim's response to my first proposition, but without me undertaking further research, for which I'm currently too busy to comply. I'm thus unable to accommodate his quiery at this time. I will when time allows answer his question.
However, I would welcome other respondents to add their contribution to the debate on van gogh, no matter how small or insignificant it may seem.