Set a trap

You return to your ship and get the girls slippers.

You go in to the forest ahead of the mother and daughter you place one of the slippers beside the path.

The mother and daughter had been walking slowly looking in every direction. They recognized the slipper and went down the path at a faster pace.

Once again they started going slow again and you put the second slipper down.

Once again their pace sped up.

They found their way to the river. The Mother was looking up and down the river.

The daughter needed to have a wee and you watched her squat next to a tree. While the daughter was occupied you grabbed the mother and took her back to your ship.

At first the daughter did not notice her mother was missing. This gave you enough time to get back and grab her. Now you had all three females.