The conditions of the appeal include a high income household
your parent household income as well as assets are the things that contribute the most to your family contribution for college. If these are high…need based aid could very well be unavailable to you.
siblings in professional school and siblings in undergrad
Siblings in professional school are likely independent for financial aid, and therefore can not be included on your forms. Other siblings in undergrad are no longer counted on the FAFSA, but as noted, some colleges might consider this. But don’t count on it giving you half of the cost of attendance in aid.
as well as a high value mortgage and student loan debt
Consumer debt is not considered when need based financial aid is calculated. That includes other college loans.
with minor medical expenses
Minor medical expenses likely won’t make any appreciable difference.
external support
if you mean supporting other extended family relatives…this usually doesn’t count either. It is considered a choice.
and other minor expenses that may be applicable.
Everyone has “other” minor expenses and sometimes for necessary things (e.g. a new furnace, a new roof, etc). These are consumer expenses that do not factor into awarding need based aid.
Correct me if I am wrong…but it sounds like you are hoping to get reduced out of pocket costs because a college you want to attend is too costly for your family. That is not a reason for need based aid to be increased.