Try tiny amounts of baby formula out of a syring but it is unlikly to work, Keep in mind that they feed almost all day everyday for the first little while.
Never touch it, you can look at it with a flashlight...don't let the siblings live with it forever. A girl can live with its mom forever, But NOT the boy!
If there is no mother for the new born hamsters, which are born blind, deaf, and naked, you can try to nurse them to a mature age (about 21 to 28 days). You will need a small feeding syringe, you can...