That is absolutely incorrect. You would only look at financial support if you spent the exact same amount of time (nights) with each parent over the one year period immediately preceding completion of the FAFSA. If you have lived with your mother, and not your father, over the previous year, your mother’s financials would be reported on FAFSA, and not your father’s.
Edited to add:
From the instructions on page 10 of the paper FAFSA:
If your parents are divorced or separated, answer the questions about the parent you lived with more during the past 12 months. (If you did not live with one parent more than the other, give answers about
the parent who provided more financial support during the past 12 months or during the most recent year that you actually received support from a parent.) If this parent is remarried as of today, answer the questions about that parent and your stepparent.