Property Dispute in Condominium ByLaws

I want to buy a property in Lonavala which comes under condominium act. The property was purchased by Mr Avinash Beedkar and his wife Satya Beedkar. Satya Beedkar was already married before and had 3 kids. Mr Avinash Beedkar was her second husband and she brought her 3 kids from first marriage to stay with Avinash in second marriage. Now Ms Satya Beedkar has died. And Mr. Avinash Beedkar is the joint Owner of the property who is alive. Now the kids of Ms Satya Beedkar are claiming rights on the property. But since Mr Avinash was the joint owner with his wife Satya Beedkar, so after her death, Mr Avinash has full right on the property. The heirs cannot claim the property, because it was jointly owned by Mr and Mrs Avinash Beedkar. And the heirs are only children of Ms Satya Beedkar from her first marriage. Plus, this property comes in condominium act, so can the heirs claim their right? There is NO Will of any kind, written by Ms Satya Beedkar. There was no nominee in the agreement.