Sir William and his wife Elizabeth are seated in the centre; around them are their nine children and their black servant, or slave, named John Brook. Sir William had family interests in the West Indies and was appointed Governor of the island of Dominica in 1770. This family group was previously thought to have been painted to celebrate this event along with the marriage in the same year of the eldest daughter, Sarah. Significantly she occupies the centre of the composition with a flourishing tree behind her. More recent research, based on the apparent ages of the couple’s sons William (far right) and John (the youngest child on the horse), suggests it may have been painted earlier.