Namine could say she would be sad if he decided not to, but she wouldn't be heartbroken. A part of her very much wanted him to, especially with how alone she had been feeling. A small family it may be, but to have a family to personally identify with would be lovely.
She smiled brightly and moved to hug him. "I will." She laughed a little. "But I will not call you Corbeau. What a silly name! And you must promise to save me from dragons and such as you once did." They likely had all summer here in the keep to get to know each other. Namine was looking forward to it, really.
"Riku, I don't know. I think only you can decide such things. It seems likely, quite likely." Too likely to not be so, probably. It didn't mean Sora necessarily liked it right now, but he wasn't going to express the negative feelings he was harboring about it. "You can start by talking to him. I left him with Namine just now, she seemed very calm about it." Likely they were catching up or sharing stories or trying to decide if they belonged to each other right now. "It's up to you, my love. I only want you to be happy." If finding and knowing his family made him happy....then fine.