Buying of Mortgage Property in case of death of one of the co-owner

There is a residential property I am looking to make a deal. This property is currently mortgage with a private finance. This property is owned jointly by 3 owners (Father, Mother and Son). The father is no more which means there are only 2 owners to the property (Mother and Son). The EMI is being paid by the Son every month. Now, I am planning to buy this property and also taking a home loan against this property once the existing Loan gets closed from another institution. Based on this scenario, I wanted to know the following: 1. What all documents I will need to submit to the bank to avail a loan on this property. I am aware of Property Agreement, Death Certificate, NOC from Builder, Maintenance Bill Copy, BMC Assessment Bill. Is is mandatory to submit a Succession Certificate as well or Death Certificate is sufficient to get a home loan in such condition where one the owner is expired. 2. If it is mandatory to get a Succession Certificate then what is the process and how long it will take to get it from the court ?