I would pay off the debt, buy the mattress (I TOTALLY understand sleep and mental health issues :( Â ) but stick the rest in a money market. Â Hear me out...
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I TOTALLY AGREE that student loans SUCK. Â But your budget is so tight right now it squeeks and one nasty emergency is going to land you right back into debt.
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Sit on the remaining money. Â If you can grow it by the time he's out of school and can pay down some of the school loan, great. Â But in the meantime, you need to pay for books (which are so NOT cheap--even used) and there are all kinds of crap that can hit the fan and land you in debt again. Â Heck, even car registration renewals and the occasional birthday gift are going to be problems. Â I might even set aside $1,000 of the remainder money as a sinking fund for a flat tire, legal stuff (like the car--and btw, insurance??), etc. and then take the rest and sit on it. Â Reason being is that if you start dipping into a much larger pot, it's easy to whittle away the whole thing.
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Your long-term goal sounds great. Â I just suspect it might take longer than you think to do. Â Multi-families/apt. buildings cost more and therefore require more down payment. Â And once you get more than 4 units, you're going to be hard-pressed to get around putting less than 20% down even if you're going to live there (unless the mortgage banking climate changes again). Â It's usually a different lending scene when you go over 4 units. Â But you could do a 2-family and still make a huge impact on your finances. Â :) Â Plus, you could keep it when you leave, continue to rent it out and possibly have income. Â :D