If the extra $18,000 (over what your siblings receive) were the only sticking point, one option would be for your father to loan you the money and for you to pay it back at a fair interest rate.
I agree with the other posters who have said your dad may be giving away too much money given his age. Perhaps it would be worth visiting a certifed financial planner to get a professional opinion on the plan.
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financial checklist:
[x] emergency fund fully funded [x] no cc debt [x] >10% to 401k
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