1. Brother can gift to wife
2. A minor of 12 years is not capable under law to hold any property
3. So if brother gifts the property to minor then it will be through the guardian of minor
4. If the property is required to be sold during the minority of the child owner then the guardian will have to file a guardianship petition in court and obtain permission of court to sell the minor's property
5. Also the money received on sale will have to be applied as would be directed by the court
6. So its better that property is gifted to wife to avoid above hassles
7. Usually stamp duty on gift deed in favour of near relatives is at a concessional rate as opposed to normal sale transfer.