If this isn't the one you're looking for, you might be referring to one of these:
(e.g., Currently Streaming, Post-Production, Coming Soon). 📝 Compelling Narrative Breakdown The Logline (1-2 Sentences): my cousin sister web series imdb link
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Cousin Sisters: Forbidden Love (2018) - Full cast & crew - IMDb you can add - Facebook
: A popular Hindi comedy-drama mini-series produced by The Viral Fever (TVF) . It stars Ahsaas Channa and Namita Dubey as sisters whose lives are upended by a younger sibling's antics.
He is my cousin. If you want to specify the gender, you can add - Facebook