The police chief of Sao Paulo said today that a third family -- Argentines of German extraction -- sought as one of the South American protectors of Josef Mengele had been found and had corroborated accounts of the activities of a man said to be the Nazi war criminal.

Police chief Romeu Tuma said Ernesto Glawe and his son, Norberto, had taken care of a man introduced to them as Peter Gerhard, said to be in need of "fraternal help," for two months in 1976 when he left the hospital after suffering a stroke.

The Glawe family had been mentioned in the original request for an investigation from the West German federal prosecutor's office. An earlier report in The Washington Post incorrectly gave the name as Saurer.

The Glawes were introduced to "Peter Gerhard," now believed to be Mengele, by an Austrian, Wolfgang Gerhard, Tuma said, adding that "this indicates that all the relationships permitted to Mengele were through Wolfgang Gerhard."

Tuma said the Glawes said Peter Gerhard had told them he had been looked after by a Hungarian couple. This supported the testimony of Gitta Stammer, who said she and her husband had sheltered Mengele.

The testimony of the Bosserts, an Austrian couple who said they later protected Mengele until his reported death by drowning in 1979, was supported because the Glawes had met them at the house where Mengele lived.

The Glawes said that in 1976 the Bosserts were away when Mengele suffered a stroke and was taken to a hospital in Sao Paulo.

They then looked after him at his house for two months, they said, but broke off contact when they saw an advertisement for the Mengele family firm in a magazine by his bedside and suspected his identity. They said he had told them he had been a doctor in the German Army, treating wounded soldiers.

Tuma said the forensic examination of the remains believed to be Mengele's was continuing but that final results were not expected for at least a week.