Should I tell my son-in-law that my daughter is pregnant with another man’s child?

A few days ago, my daughter had found out that she was pregnant from an affair she had while her husband was at work. She begged me not to tell her husband that the baby isn’t his. She claims that she still loves him too much for him to leave her, and that she doesn’t know what was running through her head at the time. I couldn’t be more disappointed and ashamed by her actions. I would’ve never expected her to do anything such as cheating.
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Should I tell my son-in-law that my daughter is pregnant with another man’s child?
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