I’d urge a degree of caution. You can accuse your daughter and her father of fraud but there are very serious consequences if the allegation proves to be false. And if you knew of the fraud–and that will be an issue since you admit to getting emails from FAFSA–the question will be asked as to whether you were aware or complicit in what was happening but elected to keep quiet.
@thumper1 You are absolutely correct. If the students indicates their parents are divorced, the FAFSA will only seek information from the custodial parent. The non-custodial parents financial details will not be collected. The process for determining who qualifies as the ‘custodial parent’ is clearly defined.
My final question: why would you want to drag your daughter through this?