Here is a good resource: https://www.csac.ca.gov/sites/main/files/file-attachments/summary_of_changes_for_the_2024-25_fafasa.pdf. Generally speaking, a divorced parent who has not remarried will only need their own signature. Note that the FAFSA parent is no longer the one the student lives with most … the new definition is the parent who provides the most support. This will be a change for some.