Razi al Deen Ibne Taaoot the grandson of Shaikh Toosi (ra) was an erudite scholar who was known for his piety and learning. He was so careful in his life that he went to the extent of doing even the Mubah (Legitimate) things with due process of discretion.
There is a very interesting incident recorded in the history about Razi uddin. One person had developed a suppurating boil on his thigh. It was giving him lot of trouble. He took treatment from many physicians but to no avail.
One day he was sitting on the banks of the river at Samarra and brooding about his ailment and performing the ablution.. At that time five persons came near him and put their hands on his thigh and the wound instantaneously healed. He asked who those five persons were.
One of them said, “I am your Imam e Zamana (a.s)!” While departing the Imam (a.s) also said, “When you reach Baghdad, people will be curious to learn about your miraculous cure! The ruler there will call you and try to give you gifts. You shouldn’t reveal to him this incident. You must go to my son, Razi Uddin Ibne Taaoot. He will provide you financial assistance.”.
Later on the person reached Baghdad. The grapevine had carried the news about what happened to him before his arrival there. As soon as he entered the precincts of the city, people snatched pieces of his robe thinking that it was an offering from the Imam (a.s). The ruler called him and wanted to give him valuable gifts. The person refused to accept them. He then approached Razi Uddin who was also present at that moment.
We can well imagine the august status of the family of Sheik Toosi that his offsprings were Mujtahids and his grandson was mentioned by the Imam e zamana (a.s) as his son.