birth of a new coparcener. Then such a coparcener has right to partition of the coparcenary property. He can bring about his separation in status by some definite and unequivocal unilateral declaration of his intention to separate himself from the family and enjoy his share in severalty. On such partition, the shares of coparceners are defined and then specific property is vested in him. Till partition takes place, he is having right of joint possession and enjoyment. There is community of interest between all members of the joint family and every coparcener is entitled to joint possession and enjoyment of coparcenary property and to be maintained. It is well established that the essence of coparcenary under Mitakshara Law is unity of ownership. The ownership of the coparcenary property vests in the whole body of coparceners. According to the true notion of an undivided family governed by the Mitakshara law, no individual member of that family, whilst it remains undivided can predicate that he was a definite share e.g. one third or one fourth in the joint and undivided property. His interest is a fluctuating interest, capable of being enlarged by deaths in the family and liable to be diminished by births in the family. It is only on a partition that he becomes entitled to a definite share. Considering this, according to me, there is no vested property in a coparcener and therefore proviso (b) to S.12 cannot be attached. It is only those properties which are already vested in the adoptee prior to adoption by inheritance or by partition in the natural family or as sole surviving