Wanted to understand from students of parents or students who applied to Stanford if, we have a advantage for the applicant to have had her or his siblings attended Stanford in the past?
At Stanford, “legacy” applicants are defined as the children of Stanford graduates at either the undergraduate or graduate level.
https://provost.stanford.edu/2020/06/26/admissions-considerations/
Agree that legacy pertains to the parents, but even that does not guarantee admission in a competitive environment.
While true, I believe the OP is asking for apocrypha to prove / disprove sibling legacy. Pointless, to be sure, but no more pointless than portal astrology posts. 
Regardless of the examples provided, the OP should be aware that correlation does not imply causation.
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Nothing guarantees admission to Stanford, but legacy status greatly improves the odds.
Folks…I’m confused. So do siblings count as legacy…or not when their younger sibs apply to Stanford?
From @Gumbymom’s link:
“At Stanford, “legacy” applicants are defined as the children of Stanford graduates at either the undergraduate or graduate level.”
“In the undergraduate Class of 2023, which was admitted for Fall 2019 entrance, 16.2% of the enrolling class (302 admitted students and 276 matriculating students) were the children of Stanford graduates. For some of these students, their admission files also noted a history of philanthropy. An additional 1.5% of the enrolling class (34 admitted students and 26 matriculating students) had no legacy affiliation with Stanford, but their admission files noted a history of philanthropy.”
I would say the answer to your question would be no.
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Looks like the answer to this is NO.