Share in the maternal grandfather propert

Your mother had a right to acquire the property during her lifetime. But you cannot claim a share in your maternal grandparent's property. On your mother's demise, her share would devolve over you and your siblings. But you can still ask for a share as per your entitlement from your uncles. If they are reluctant to divide a share with you, you can file a partition suit seeking your share out of your mother's share from her parent's properties.