Mixed kids, same parents, different skin color

Just curious; anyone have mixed kids (with the same father) and their skin colors are different?? I have a 2 year old son and he’s gotten much darker as he’s gotten older, but when he was a baby he was very very light, basically white. I’m white and his dad is black. I’m currently pregnant with our second child and am curious if she’ll be just as light or if she’ll come out darker. He has another child by someone else and she’s just as light as my son so i can’t imagine her being darker then them but i guess it could happen!