My family owns a flat in a cooperative society, with the ownership listed in two names. Can a third name be added to the ownership? If one owner passes away, can they will their share to their daughter? Does the will need to be registered or go through probate?

Adding a third name to the ownership would require consent from all existing owners and the society’s approval. Yes, the deceased owner can will their share to their daughter. The will must be registered with the society and probate proceedings are required to transfer the ownership legally.