If the petitioner is a parent of the child they should be providing financial history to the court/DHS, but not necessarily to you. You can ask for it as it may be informative on establishing child support obligations, if they object, ask for any sensitive information such as SSN to be redacted.
You can also ask for a copy of the homestudy with any sensitive information redacted.
Every legal matter is fact specific, and there are often nuances in every case. This is intended for comment only, and does not create an attorney client relationship.