In In re DeJohn B. (2000) 84 Cal.App.4th 100, the mother's whereabouts were unknown at the time the child was detained. (Id. at p. 103.) The Orange County Social Services Agency (SSA) had only her name and last known address in Long Beach. (Id. at pp. 103-104.) SSA sent a telegram to that address with information about the detention hearing, and mailed a copy of the petition and notice of hearing to the same address, and to two addresses in Bellflower. (Id. at p. 103.) The father told the social worker that the mother had abandoned the children six or eight months earlier, and that the mother had spoken with him only twice during that period. He believed she might be living on the street. (Id. at p. 103.) There was no indication that SSA asked the father about the mother's relatives, friends or others who might know her whereabouts. At the six-month review hearing, the court set a section 366.26 hearing. SSA sent a notice to the Long Beach address, advising the mother of her right to petition for writ relief. One month later, SSA located the maternal grandmother and obtained the mother's address in Las Vegas. SSA sent a notice of the section 366.26 hearing to the Las Vegas address. SSA did not explain how it found the grandmother or why it had not located her sooner. The mother signed a receipt for the notice, contacted the social worker, and requested visitation. (DeJohn B., supra, 84 Cal.App.4th at p. 104.) The mother stated that she had left the children with her brother while she looked for a job, and the next day, the father took the children. (Id. at pp. 104-105.) The mother had searched for the children without success. (Id. at p. 105.) She stated, and the father confirmed, that he had concealed the children's location. (Id. at pp. 104-105.) At the section 366.26 hearing, the court denied the mother's motion to set aside the six-month review findings, denied her section 388 motion, which sought the children's return or services, and terminated parental rights. (DeJohn B., supra, 84 Cal.App.4th at pp. 105-106.) The Court of Appeal reversed, stating that SSA had done nothing to find the mother and provide her with notice of the proceedings. (Id. at pp. 108, 110.)