My SIL received her child tax credit check back in July. But her husband (they are separated) refuses to sign the check - his attorney has advised him to but he refuses. She has full custody of the children. Can she return the check to the IRS and then will she get the money back when she files her taxes next April. He is only going to be paying child support for the months of Oct., Nov. and December. There are two children. A domestic violence order gives her full custody for one year.