Kids 2 and under are free. Ages 3-12 are $28.95. Above 12 is adult priced. What i suggest is the Mommy and Me pass it's about $48 with tax but it pays for one adult and up to 4 kids in (under 5 yrs of age though).
They have a Mommy and me price is $49 for 1 adult and up to 4 kids ages 5 and under. Not sure if you can use it on the weekend. I used it on a Monday for two 5 year olds and myself.
Free for kids under 3. Also check out Citypass if you're planning on doing other activities. The bundled price is a much better overall deal if you have the time.
$28.95 for kids 3 to 12. Full price after that.
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