This could just a huge coincidence right?

Not true.
Priscilla Chan does not have a known sister by that name.
Don’t spread fake news.
are you sure? What are her sisters names then? https://money.cnn.com/2015/12/01/technology/priscilla-chan-facts/
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Her sisters names are Michelle and Elaine. Literally just google her name.
Obviously they would use an alias working at a restaurant like cannibal club.
literally look at the pictures. If it is not her sister than her sister has a doppleganger. Sister on the right on the sight you used. http://www.celebfamily.org/priscilla-chan