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I'm new at this so I may be telling you something you already know but I thought I had seen several questions on threads asking how to transfer info so as not to repeat the process. After filing the first FAFSA, there is a link on the confirmation page that allows you to do that. Look for this near the top of the page:
Optional Feature - Transfer your parents information into another FAFSA - Do your parents need to complete a FAFSA for your brother or sister? Click here and all the information your parents provided in this application will be transferred to a new FAFSA. Your parents will have to provide a signature again, but that's all.