You need to include Form 1310 in his return and complete the information called for in that form.

Is the Form 1310 on the Turbo tax site where I can fill it out online through Turbo Tax?

Many of the programs do include this form.  I am not familiar with TTPlus so I can't direct you to where it might be.  In other programs, it is in the Federal, Other Forms area.

Thank you