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Unlawful discrimination requires a non-neutral rule that either treats or impacts a particular group disparately.
The two rules you describe apply to everyone, so they are neutral in character.
The rules also apply identically to residents with and without children. So, there is no disparate treatment.
The rules may impact residents with children disparately, but it's a very close call -- because: (1) adults play basketball; and (2) adults make noise late at night.
Based upon the Fair Housing Act, and your stated facts, the rules would appear to be lawful. Which means that your recourse is to vote against the CC&R amendments -- or petition to recall the HOA board, and replace the directors with persons who are more in alignment with your position on the issues.
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