This decision has some interesting points. He is currently not able bodied and does not have any earning capacity currently.
http://www.court.state.nd.us/court/opinions/980130.htm
This law will be very important to look up and understand: N.D. Admin. Code § 75-02-04.1-07
This was an interesting decision. The appeal court says that the party should request permission for a delay in making the support payments, not a permanent reduction.
http://www.court.state.nd.us/_court/opinions/940194.htm
Child support with disability decision:
http://www.court.state.nd.us/_court/opinions/960205.htm
How much medical documentation do you have about your DH's current condition and prognosis? Could this possibly turn into a permanent disability? You will need letters from the doctors or chart notes that document this for the judge.
It looks like ND takes multiple families into consideration in the calculations. Is his multiple families taken into consideration in the current support order.