Answered by Shaykh Jamir Meah
Question: Assalamu alaykum
Can a Muslim call a non-Muslim ‘Brother’?
Answer: Assalam ‘alaykum. I hope you’re well insha’Allah.
Yes, it would be permissible to refer to or respond to a non-Muslim as a ‘brother’ referring to the common brotherhood of humanity.
According to some scholars, it would also be permissible to greet a non-Muslim with ‘Assalam ‘alaykum’ and respond to their greeting with ‘Wa’alaykum assalam’. The permission is more desirable if one hopes for their Islam. And Allah knows best.
[Sharh Sahih Muslim]
[Shaykh] Jamir Meah
Shaykh Jamir Meah grew up in Hampstead, London. In 2007, he traveled to Tarim, Yemen, where he spent nine years studying the Islamic sciences on a one-to-one basis under the foremost scholars of the Ribaat, Tarim, with a main specialization and focus on Shafi’i fiqh. In early 2016, he moved to Amman, Jordan, where he continues advanced studies in a range of Islamic sciences, as well as teaching. Jamir is a qualified homeopath.