42 year old Sarah

Sarah had just completed medical school when she meet William Carter. Together they had bought the spaceship and started working together. Her knowlege of medicine helped earn them a great deal.

They had also started a family on board their spaceship.

Then Adam had been killed and Sarah, who had been planning to take the children and live on a planet while her husband traveled around, was now forced to stay on the ship and raise her family in space.

How many children does she have?