Born in Eaglesfield to an unmarried mother, Lockhart was raised by his grandparents in Sibbaldbie and then Annan.
He was first taught to draw at Annan Academy where he excelled to such a degree that at the age of 14 he was accepted into training by the Royal Scottish Academy. By 15 he was already submitting work to the RSA Annual Exhibition.
Theodora and Marjorie were the third and fifth of his six children and at the time of this painting Theodora (on the left) was six and Marjorie was four. Lockhart adored his daughters and he expresses that affection in this image through the depth of their eyes, the detail in their hands and the richness of the colours.
On her death Theodora left this painting to the town of Annan.
In the collection of Annan Museum.