[ Minato doesn't think being family factors into this at all, but maybe that's where Sora's concern comes in, and Minato's concern too- that if something does happen down here to Sora because he insisted on staying...

It's not like it's any one of their's decision. If Minato decides to stay, and Sora decides to look after him, they can both share responsibility for what happens. ]

If that's what you want to do, then sure. I won't tell you to go away.

[ He wants to say it's his last chance to catch the train home, but he's not sure it's still waiting there anymore, so instead, he turns his head to the shops, trying to determine which one would be best to stay in. ]

I'll stay here and gather some reading material first. If you want to grab anything else, don't stray too far, alright?