Please see the instructions for Form 3800 in the following link.
Form 3800 instructions
Since the parents did not file Form 540NR, but filed a Form 540 instead, I recommend using the line items that most closely match the items on the 540NR. For example, if the 3800 is asking for the parent's taxable income, look for the line item on Form 540 for this amount. The forms are similar. They only differ in that one reports the activity for a resident while the other reports the activity for a part-year or nonresident.
I have attached links to the blank 540 and 540NR to assist you in matching the appropriate lines up. The instructions above also break this information out.
Form 540
Form 540 NR
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