Should I tell them?

I recently found 2 of my childhood friends' boyfriends on the dating app OkCupid. They're sisters and the older sister has a child with her boyfriend, turned 1 today, but I haven't spoken to either of them really in years. I'm super conflicted on whether I should tell them about this, because I don't want to come off as sticking my nose in their business if they know about it (they are honestly a very dramatic family and often take things out of context/escalate things). Normally, I wouldn't hesitate but since I really have no clue on what their personal lives are like, I'm hesitating. Thoughts please!!

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