Section 29D. The department shall provide notice of hearings held under sections 26, 29B and 39G to a foster parent, pre-adoptive parent or relative providing care for the child who is the subject of the petition and shall inform the foster parent, pre-adoptive parent or relative of his right to attend the hearing and to be heard. Nothing in this provision shall be construed to provide that such foster parent, pre-adoptive parent or relative shall be made a party to the proceeding.