Other than Eden being protective of Aria there are no other hints of them being siblings. While Kouga and Aria have the same light cosmos and they both don't know their parents. The preview for this episode also hinted at them being siblings, what with the " Aria feels Athena's light in Kouga and Kouga feels Saori's kindness in Aria" line. But we won't know anything for sure until they actually confirm it.
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