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<p>If your dad had NOT received the bonus, whatever expenses they spent it on (medical bills, the house) over and above the tax bill would have had to be spent from some other pool of money (borrowed, credit cards, etc.). They used the bonus on those expenses, not anticipating your situation, now they should use the other pool of money for YOU. In reality they would be in no better or no worse situation for having got a bonus, which pretty much sucks, but that’s how it is with money sometimes.</p>
<p>The most you can do is try to appeal, but as others have pointed out, funding your brother’s education and that of assorted cousins is THEIR choice.</p>