would you tell your siblings SO?

Li
I came across this post on Facebook. Say that you find out your sibling has cheated on their SO. Do you tell the SO? 
Personally, if my sister cheated on her husband, I may lecture her and encourage her to her her husband, but I'm not telling. It's not my place. He gets suspicious, I'm covering for her. She wasn't out with some guy, she was with me and we went shopping. My loyalty lies with my sister, not the spouse. What is your take? 

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