Answer
(Fatwa: 625/382/D=1432)
As the rights of mother and father are towards sons and daughters that they should obey them, they should help them financially and physically and visit them time and again, the grandfather and grandmother have the same rights as well. The grandson and granddaughter are small, it is necessary for their parents that they should carry them time and again to the grandfather and grandmother. They may carry and take back them along them. You wrote that your brother’s wife doesn’t let her kids meet your mother and sister. Isn’t this related to any misunderstanding? It is also harmful to allow the children to go and come every time in the views of training? How does the wife of your brother stop? After how many days does she allow to meet? And why does she do so, write it by asking her.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband