No, it means to list Father and Stepmother’s income and assets separately. “Father makes $100k, has $50k in assets” “Stepmother makes $600k, has $500k in assets” The assets might be in a joint account with $550k in it, but in this case the F and Step know who owns the assets. If they do not know or the assets can’t be easily divided, assign half the value to Father and half to Step (so each ‘owns’ $275 of this $550k asset).
You would do the same for Mother and Stepfather. You may have 4 parents you are listing income and assets for.