Column | Carolyn Hax: What to do when ‘pretty sure’ sister-in-law is getting cheated on?
- Posted on October 4, 2025
- By Washington Post
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Column | Carolyn Hax: What to do when ‘pretty sure’ sister-in-law is getting cheated on?

Letter writer is “pretty sure” about infidelity in husband’s sister’s marriage but feels stuck on what to do about it.