The brother could not immediately be reached for comment.
German Foreign Ministry spokesman Martin Schaefer told reporters in Berlin on Monday that he couldn't confirm reports that German citizen Hamed Abdel-Samad had been kidnapped in Egypt. He did say Abdel-Samad's whereabouts were currently unknown and a crisis team has been set up to determine where he is.
Schaefer said the writer had been in contact with the German Embassy in Cairo about his personal security.
He said the German ambassador will meet with officials from the Egyptian Foreign Ministry and appeal for them to find Abdel-Samad. The ambassador has already had a phone conversation with Deputy Prime Minister Ziad Bahaa-Eldin, he said.
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AP writer Frank Jordans contributed to this report from Berlin.