Hello,
If the property is ancestral all sons have equal rights. In other words all sons should have equal rights. Unless all other brothers relinquished their rights your uncle had n right to register it in his wife's name.
I'd the property was self acquired by grandfather and he died without leaving a will all birds children have equal rights or share in the property.
In either case you can challenge the transfer of property and demand partition of the property.
Engage a lawyer locally.