Let’s start with the obvious: everyone loves the Cholmondeley Ladies. Painted in the early 17th century by an unknown British artist, the Cholmondeley ladies were said to be sisters, though not much else is known about their identities beyond this.
And now, Israeli-American artist Andi Arnovitz’s take, if one of the sisters had been infertile:
Also, a really interesting interview with Arnovitz over at Hey Alma.