I’m sure @kelsmom will state again. Successful renegotiation of financial aid awards are because of unforeseen financial hardships a family has experienced between the income year for the forms, and the actual year of college. Things like loss of main income, unforeseen high unreimbursed medical expenses, large unreimbursed things like your residence burning down with no insurance. Things like that.
Some colleges have the discretion to and might take multiple undergrads into consideration. But the professional school siblings…not likely.
@aunt_bea do you have any ideas?