Can we buy property without surety signature of younger son?

Your query is silent on the fact how the mother got the property registered on his elder son’s  name . Was it a Gift deed or Will?

If the owner i.e elder son has a copy of registred Will, then we suggest that he should get the same probated and then you can buy the property. However without copy of Will or any legal document we will not suggest you to buy this property without signatures of other son, as at later stage, he can file suit for partition and cancellation of sale deed.

Furthermore, we suggest you to consult local lawyers in Bangolre, after examining the documents and performing complete due diligence of title, they may be able to further provide legal solution.