Child Support question

My wife and I have been separated for a year now. We both share custody of our son. I have him for a week and she has him for a week. We both pay half on his daycare. She pays for his insurance premium. My question is I have used the child support worksheet B calculator. She has three other kids from her first marriage. They all three live with their father. She pays only 300 a month for the kids. Does what she pay to her ex affect how much I will have to pay? she only has them(3) every other weekend. Thanks for all your help.

Yes, her obligation to her other children should reduce her obligation to support the child you have with her. The calculator reduces her income by an amount for what her obligation should be for those 3 children, before calculating her obligation for your child