1. Brothers are at liberty to release their share in favour of sister through a registered release deed.
2. Your sister too can release her share in the residential house in your favour.
3. Since your mother had died intestate in respect of the residential house that was bequeathed to her by her husband it has now devolved in the share of 1/3rd each on all three of you.
4. In the plots too the share of every heir is 1/3rd. Any heir is free to file a suit for partition to cull out his/her share if there is no amicable settlement.