Can i gift to my wife what i did get gift through my brother

There is no restriction on giving cash as gift.Only thing is you must be able to establish evidence that you have actually gifted the money.So prepare a gift deed and take her acknowledgement on the gift deed.And also you can gift the amount received from your brother as there is blood relation

But any income earns by that cash gift by your wife, that will be taxable in your hand as per clubbing provision.