Gift deed clarification

After having partition of ancestral property by metes and bounds through court ,you,your aunt and step sister became absolute owner of your share of property and have every right to transfer own share to anyone through gift,sale or will,no one has right to make any objection so your step sister has no right to make any objection.

I fully agree with learned expert Mr. Bhartesh Goyal ji, your aunty is absolute owner of her share and she can gift it to you (or any one else) as she desired.

I also agree with the views expressed by the learned expert, Mr. Bhartesh Goyal Sir.  Your aunt may gift her share to you.

What do you mean by "Court approved the ancestral property share to my aunty , me and my step sister"

It appears that the property has been partitioned through the Court. 

Anyhow, there gift, as stated, is not valid.

Incidentally, father's brother's sister is your cousin, not step sister.

Your aunt becomes the absolute owner of the share of property that was allocated to her by court of law in a suit for partition.

She can very well dispose her share of property in favor of anyone and by any mode of available legal modes.

Neither your father nor anyone can object to your aunt's  acts of transferrring her share of property in your favor by executing a registered gfift deed.