And it would depend on the organizations' legacy policies. Some include grandmothers; others don't. Then when you take into account step-mothers, step-sisters, etc.:
A PNM could have a mother, a step-mother, a (full) sister, step-sister, half-sister, and 2 grandmothers, each a member of a different sorority (assuming each relative falls under their respective org's legacy policy).
I'm not saying it's common, and probably not even very likely, but it's possible.
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