Last episode confirmed it's cousin. Something about Kobato being Mom's brother's daughter or something like that.
Dunno how Kobato and Youji deny romantic interest in each other though, considering Kobato don't want Naru kissing Dora (yes, Dora came out so Hiyoko isn't special), and everything Youji did was for Kobato's sake. Not to mention the title is referring specifically to the Haneda 'siblings', going by the priest's words after the credits. XD
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