After a divorce where there are dependent children, it is likely that the payment of child support will be necessary to support the children.
Calculation of child support is done by the Child Support Guidelines Worksheet (PDF). It is in this sheet where financial information is entered and the final weekly support amount is determined.
Child support is typically paid by the non-custodial parent to the custodial parent.
You may find much more information on child custody, support, and other child related matters in Section 208 of the Massachusetts General Laws.