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Saint Seiya Omega episode 11 summary from TV Asahi:

Protect Aria! The Pursuer Sonia Attacks!
After the violent explosion in Babel, Yuna ran away with Aria in order to protect her. Through their journey, Yuna comes to feel love and compassion for the young girl that knows nothing about the world, ultimately deciding by her own will that she is going to protect her no matter what. Watching Aria marvel herself at the flowers in the ground and even at the taste of bread, Yuna spends a peaceful time. However, the child of Mars, Sonia, and Mars’ team of trackers, eventually find them. To protect Aria, Yuna fights against them but…

http://www.tv-asahi.co.jp/seiya-koga/story/11/index.html

WE YURI NOW

And yes, Sonia is indeed described as “the child of Mars”. I dunno if this means that she is his daughter or not, but it clearly says: マルスの子ども.