Property transfer to joint holder after death.

Dear Sirs,

I hold a property jointly with my father who expired last year. This is not an encestral property but a new apaprtment bought by me few years ago.

We are 4 brother & sisters and surviving mother. My father hasn't wrote his Will regarding the ownership of the property. Now what are the documents that I need to prepare / required to apply for transfer to my name. Assuming that my brother, sister and mother don't have any objection on that.