On a Saturday, or any day, give people more than an hour to respond before having a mini fit
What finaid form are you talking about FAFSA or CSS? When you say personal business do you mean your Dad owns a small business?
If your family has a small business with less than 100 employees, then no business value is included on the form.
If you are talking about the business income then, depending how the business is held- sole proprietor, partnership, corporation- yes, the income on your tax return will be reduced by business expenses.
When are you applying for school? If for next fall, the you would not yet be doing the forms. More details will help people give you better advice.