Depends on what type of dividend it is, which depends on how much money your mom's business makes.
Eligible Dividends are grossed up by 45% and you are given a tax credit of 27.5% of the dividend you receive.
Non-eligible dividends are grossed up by 25% and you are given a tax credit of 16 2/3% of the dividend you receive.
The grossed up dividend is taxed at your marginal tax rate and then your taxes owing are reduced by the credit.
Ex. 100 eligible dividend
Gross up 45%: 145
Tax at 30% marginal tax rate: $43.5
Less: Tax credit of 27.5% of dividend- $27.50
Total tax payable: $16
Dividend: $100
Net dividend received: $84
"I believe that banking institutions are more dangerous to our liberties than standing armies. If the American people ever allow private banks to control the issue of their currency, first by inflation, then by deflation, the banks and corporations that will grow up around the banks will deprive the people of all property until their children wake-up homeless on the continent their fathers conquered."
-Thomas Jefferson 1802