I'm the Mother-in-Law, But I Don't Want Any Conflict Between Us [Exclusive Side Story]

“……Mother, please conduct yourself with propriety.” My perfect daughter-in-law (who is older than me) didn't seem to take a liking to me. “Grandma…… I mean, Duchess, can I sleep over today?” Meanwhile, the noble ladies I used to badmouth have started treating me like their hometown grandmother. I married an old Duke, but my husband died the day before the wedding. And just like that, I accidentally became the Matriarch of the Ducal House. For the record, the son and his wife are older than I am. “Let’s just live quietly as a parasite.” A full-fledged Ropan mother-in-law vs. daughter-in-law conflict. A modern-day mob character who cannot understand high society. -- Self-Note : This i...