We have a set amount that we deposit weekly into their bank accounts. We haven't been consistent with their allowance, but when we do they tithe and save the rest to spend on what they want. But now I'm inspired to have them save a portion of it just to be in the habit 
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"...If you have paid your debts, if you have a reserve, even though it be small, then should storms howl about your head, you will have shelter for your [family] and peace in your hearts." - Gordon B Hinckley
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