Clogged bathtub! What to do?! No money for plumber?

My idiot brother-in-law clogged up the bathroom sink and tried to fix it. He should never try to fix things. He is only capable of breaking things. He took a plunger and plunged the sink. This only moved the clog down further and clogged the bathtub. I just paid the mortgage, car insurance and a huge vet bill for my stupid dog who ate a shoelace so there is no plumber money. There is barely food money. We have a septic tank so I refuse to use Draino or such things.

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