My husband owes back child support. I know that I file an injured spouse form, but does that form cover my children's/his step kids share of the refund as well?

[hdnelson95]

I need to find out if you children's portion of the refund will be taken or if the injured spouse covers them.

[LeeM]

The IRS will not take your child's refund for child support owed by your spouse.  They can take your refund if your spouse owes back taxes, child support, state taxes or federal taxes unless you file the injured spouse form. 

Here is a link to IRS Topic 203 which explains refund offsets.