You didn't have a claim then, and you don't have one now. Universities and colleges are not required by law to admit all applicants. You had a case only if you were denied admission based on a protected characteristic or classification such as race or religion. There is no evidence of that basis for denial of admission of you and/or your sister, so you did not have claim even before the time limits elapsed. But in all events, the time limits for brining a legal action have long since passed.
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Nothing in your post gives even a hint as to the type of discrimination you believe was involved. Based on your post, it does not appear that you were discriminated against. Even if you were, the claim is, in all likelihood, time-barred.