Property bought defectively long back, validity of title.

No the sale deed is not valid in eyes of law since sale deed is made without the written consent from the first brother.

Will u appreciate this answer by giving like on my LCi prrfile?

If the title was in the name of one brother his share can be sold by him alone or anyone who has been vested with power to sell by owner.

Thanks for ur valuable response. Can the present holder avail any protection under law of limitation? 

The limitation may not stare if it is fraud.

Your able counsel that has examined all dcos on record and facts can opine the best.