Please read the below response very carefully:
1. your father had left a Will of his house by which you and your brother were given 1/2 share each in the flat
2. as the Will was made in Mumbai, it is compulsorily required to be probated by filing a probate petition
3. without the probated Will, the flat cannot be transferred to your name, by any of the modes described by you in your query
4. probate is mandatory as per s.57 of Indian Succession Act as applicable to Wills of Hindus executed in Mumbai or pertaining to properties lying within jurisdiction of Bombay High Court
5. mere entry of your and your late brother's name in the share certificate attached to the bequeathed flat confers NO ownership title on you or your brother
6. for conferment of a valid and legal ownership title on you, you will need a registered title document in your name
7. this registered title document can only be obtained by filing the probate petition
8. in the probate petition, the consents given by your sisters as to the genuineness of the Will, will be considered as their consent affidavits to be attached to the petition,thereby consenting that they have no objection if probate is granted to you, being the applicant/petitioner
9. in probate petition, the consent affidavits of all legal heirs of the deceased are required to be attached. Since your brother died after your father, your brother's legal heirs i.e. his wife becomes entitled to the half share in the flat bequeathed to your late brother in your father's Will. So her consent affidavit will also be needed. Since she is agreeable to give up her claim on the 1/2 share in the flat to you against consideration, I do not see any reason why she would refuse to give such a consent affidavit, as informed by you in your earlier query on the same subject. If there is any apprehension in her mind, then a MOU can always be executed with her where binding arrangements can be agreed between you and her for release of her right in the flat to you, by accepting some token on signing of MOU and balance at a later time
10. once the probate petition goes through, you will be granted the probate using which you can then execute transfer deed in the capacity of an executor/administrator in favour of the beneficiaries named in the Will of your late father
11. so a transfer deed will be executed whereby you will be the transferor (in capacity of executor/administrator) and you will also be the transferee (in your individual capacity) and your sister in law and your 4 sisters will be the confirming parties. By this transfer deed the entire flat will be transferred in your favour. Upon due registration of this transfer deed, your title to the flat will stand completed [and not by any of the modes described by you in your query]
12. now coming to stamp duty on the above transfer deed. There will be nominal stamp duty of Rs. 200/- for transfer of your half share to yourself. Whereas for transfer of the other half share for which you would have agreed to pay certain sum to your sister in law under the aforesaid MOU, stamp duty will have to be paid on the market value of that half share
13. if your sister in law or you wish to avoid payment of above stamp duty, the transfer deed can be executed in your favour and your sister in law's favour separately on nominal stamp paper of Rs. 200 and both can be registered
14. thereafter your sister in law can make a gift deed of the half share to you which attracts concessional stamp duty of 3% as opposed to 5% on market value of half share
15. the consideration to be paid to your sister in law by you can be routed. You can make a gift of the cash sum to one of your sisters or to each one of them and they in turn can pay that money to your sister in law for transferring the shop in their names. If any excess has to be paid, that will have to be borne by your sisters. Ofcourse stamp duty will be payable on this transaction. The excess payable by your sisters to your sister in law can be adjusted against the cash sum left by your brother and only balance would required to be transferred by your sister in law to your sisters.
16. please take note that even though the Will is not probated, your late brother is entitled to his half share bequeathed to him by the Will. On his demise, his share devolves on his wife. So your sister in law is entitled to half share legally and NOT 1/6th as contended by you. If there is a testamentary writing like a Will, then distribution as per intestate succession is excluded. The wishes of the testator must be given effect to. By your dad's Will, he did not desire to give any share in his flat to his daughters. So they stand excluded. Even your sisters have accepted the Will as genuine. So now they cannot back out. Thus your sister in law is entitled to half share even if the Will is not probated. Her entitlement gets crystallised when the Will is probated and transfer deed for the half share is executed and registered in her name. Just because the Will is not probated, does not mean that her right has gone away. Her right subsists.
17. when your sister in law makes a gift of her half share in the flat to you, neither the donee nor donor incur any income tax or capital gains tax liability. Capital gains tax arise only when consideration is passing between the parties.
18. also for transferring the shop to your sisters by your sister in law, the shop has to first be transferred to the name of your sister in law by taking out a letter of administration. Or once such LA is obtained, the shop can be directly transferred to your sisters by your sister in law (in her capacity as administrator) with permission of the court
NONE OF THE TRANSFERS LIKE SALE DEED OR GIFT DEED OR FAMILY ARRANGEMENT AS DESIRED BY YOU WILL TAKE EFFECT WITHOUT PROBATE OF YOUR FATHER'S WILL AND WITHOUT OBTAINING LA FOR YOUR LATE BROTHER'S ESTATES
KINDLY CONSULT A COMPETENT LAWYER FOR PROPER ESTATE PLANNING INSTEAD OF DEVISING STRATEGIES WHICH DO NOT CONFIRM WITH THE PREVALENT LAW