When asking for more merit aid, is it best for the parent or the student to email?

Thank you all. We’re new to this and have researched the topic a lot. I kept reading the student (even though ours isn’t even 18 yet)! We have hopes (slim we realize) for more merit aid at 1 of his top 3. Other two haven’t awarded yet. And, we have significant $ change in circumstances. Ultimately, he crafted a letter (with parent bullet points to include) to his #1 choice and stated he was attaching further information, which was all of the factors in detail from us/parents). We will also follow up. And take all of this info. into consideration regarding the other two schools before contacting. Much appreciated!