That is one thing I have wondered. Linderman said he was responsible for Niki & DL getting together. Perhaps Nathan's mom is somehow responsible for Nathan getting together with Claire's mom, even if for a short time, so that Claire would be born. We do know that the Petrelli's mother and Linderman were working together.
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-Michael

#040103696 on a shelf
Mk2a - 90 GB - Red - Illuminated buttons