Zoheir Ali Esmail,
Shaykh Zoheir Ali Esmail has a Bsc in Accounting and Finance from the LSE in London, and an MA in Islamic Studies from Middlesex University. He studied Arabic at Damascus University and holds a PhD from the University of Exeter in the philosophical and mystical readings of Mulla Sadra in the context of the schools of Tehran and Qum.
Thank you for your question. It is not necessary for the wives to know each other or be friends in a polygamous marriage in Islam.
May you always be successful