An obligor-parent alleged to be in arrears may use any of the following grounds as a defense to the motion filed pursuant to this article or as a basis for filing a motion to stop a sale or use of assets under Section 4631:
(a)
Child support payments are not in arrears.
(b)
Laches.
(c)
There has been a change in the custody of the children.
(d)
There is a pending motion for reduction in support due to a reduction in income.
(e)
Illness or disability.
(f)
Unemployment.
(g)
Serious adverse impact on the immediate family of the obligor-parent residing with the obligor-parent that outweighs the impact of denial of the motion or stopping the sale on obligee.
(h)
Serious impairment of the ability of the obligor-parent to generate income.
(i)
Other emergency conditions.