Is removing the mother from her home two months after her husband's death, while she is in her 'iddah (waiting period), in order to bring her to live with her son and his wife, considered a violation of Allah's Shari'ah? And what should be done after her arrival? And what is the expiation for that?

A woman whose husband has died is obligated to observe the waiting period (iddah) of four months and ten days if she is not pregnant. Among the rulings of this waiting period is that she must not spend the night outside her home except in cases of necessity. It is not permissible for a woman observing the waiting period after a death to travel for the obligatory Hajj or for any other purpose.

Therefore, bringing the mother from her country was against the Sharia, and one must repent to Allah for this sin. The mother must return to her country to complete her waiting period in her home, for a woman observing iddah, whether due to divorce or death, is not allowed to travel during her iddah. If she travels, she must be returned to her home until the iddah period expires.