I came across the following ayaat today in Surah ahzab with reference the adopted son of the Prophet saw, Zayd ra:
Allah has not made for a man two hearts in his interior. And He has not made your wives whom you declare unlawful your mothers. And he has not made your adopted sons your [true] sons. That is [merely] your saying by your mouths, but Allah says the truth, and He guides to the [right] way.
Call them by [the names of] their fathers; it is more just in the sight of Allah . But if you do not know their fathers - then they are [still] your brothers in religion and those entrusted to you. And there is no blame upon you for that in which you have erred but [only for] what your hearts intended. And ever is Allah Forgiving and Merciful.
Which got me wondering whether it is ok to address one's parents in law as mum and dad, when they clearly are not. At times, people really think my mother in law is my mother and it gets all confusing. But culturally, it is expected that one addresses them as mum and dad. Personally I don't think its very fair on my poor parents who really deserve that title and shouldn't have to share it with others. What do you guys call your parents in law (please mention your background) and in light of the aayah, is it incorrect to address them as mum and dad when they clearly are not?