The Jukes family
has already raised more than PS3,800 since the fund was set up after Alan's mum, Kath, died from fibrosis of the lung in August 2011.
The painting, by a female chimp called Cindy-Lou, has been in the ownership of the Jukes family
, of Hopton Bank, Kidderminster, since 1966.
In addition to a doctoral degree from Johns Hopkins, Estabrook's scientific experience included his investigation of the Jukes family
, a notorious New York clan first examined in the 1870s and described in the classic study, The Jukes.