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[DonH]

I'd day they have either guessed it on their own or he has said something. You really don't need to ask him out in the short term. I'd be available and friendly. Let him know you'd be interested. If he doesn't act on it within a few weeks, you might want to drop a few more hints or even bring up how these people are saying you guys should be dating or whatever. Let him know you'd say yes if he asked. If you do that he likely will. That's my suggestion. I would not run due to what his sister said. No concern there.