Question 1131951
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Andre came up with the following puzzle. “I am three years younger than my brother, and I am 2 years older than my sister. My mom's age is one less than three times my brother's age. When you add all our ages, you get 87. What are our ages?” 
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<pre>
Directly from the description:

Andre            y
Brother          y+3
Sister           y-2
Mom              3(y+3)-1
SUM              87
</pre>
Self-Explanatory:   {{{y+(y+3)+(y-2)+(3(y+3)-1)=87}}}


Solve the equation and evaluate all the other ages.