Dear Client,
In your situation, although there exists no formal agreement or documentation for the ₹25 lakhs handed out to your brother, the fact that the payment was made through a cheque and was witnessed by your mother and other family members puts your case in a much stronger position. Legally, lack of written documents does not bar you from recovering the amount, as oral agreements supported with credible evidence such as witnesses and financial records are admittable in court.
To recover the amount, first, you need to issue a notice to your brother, under Section 433 of the Code of Civil Procedure, for the to return of ₹25 lakhs. In that, you have to state the circumstances of the payment; that is, mention the context in which the payment was made with the understanding that it is in pursuance of his share of the property; and the revocation of the gift deed invalidates any claim to that amount. Moreover, point out that you have witness testimony and a cheque transaction in your favor for substantiating your claim.
Should your brother not comply with the legal notice served upon him, you can institute a civil suit under the Code of Civil Procedure, 1908, to recover the money. Any paunees or documents of the cheque transaction and verification of the witness may sufficiently size up to your credence. Further, your mother and family members who may be called forth for such testimony will preserve your case.
It is best if you consult a legal expert on this matter for a particular notice to be made and to conduct your case adequately if a pending matter arises in the future. Any delay here would spell disaster, given that it was a case of future profit.
Hope this answer helps. Please feel free to reach out with any further queries.