Section 36. On petition under any provision of this chapter by a guardian or conservator of a ward who is a tenant by the entirety of real estate or by a receiver, appointed under chapter two hundred, of an absentee person who is such a tenant by the entirety, for a license to sell, mortgage or lease such real estate, the probate court may, if the other tenant by the entirety assents in writing, authorize such guardian, conservator or receiver to join with such other tenant by the entirety in the conveyance, mortgage or lease of such real estate upon such terms as it may approve.