As you said that the properties belonged to your grandparents and your father was allocated his share after their life time, the said properties will be considered as your father's absolute and own property having marketable title to the said share of the property.
Some of my legal queries are:
1. Is this transaction legal ?
Since it being your father's own and absolute property, he has full rights to transact with the same in any manner as per his own sweet will and wish, hence this transaction is very much legally valid.
2. Do I have any legal share in the property ?
You shall not acquire any rights in the property
.
3. What is the course of action for me ?
You may pacify your father and request him to allot some share out of the said property and also you may pose a threat that if your request is not acceded you may file a partition suit, let him think about it.
No Doubt a partition suit may not fetch you desired result, you may file one and rattle the issue which may put some pressure on them to rethink about giving you a share in the property.