Q: Is it permissible for one to marry his divorced wife’s sister while his divorced wife is in iddat?

A: It is impermissible.
( و ) حرم ( الجمع ) بين المحارم ( نكاحا ) أي عقدا صحيحا ( وعدة ولو من طلاق بائن) (الدر المختار 3/38)
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Ihyaaud Deen An Effort to Revive Deen in Totality