Well, we know Regina can crush hearts in a magicless town, as evidenced by the Sheriff Who Shall Not Be Named. But the boy is so young, what did Regina do after she killed his father? She can’t just put him on a bus to Boston. And no one else can leave SB except her, so unless she left and took him to a orphanage, I think both Ben and “Owen” got out.
Well, it’s possible for “Greg” to be grown-up Owen, which would mean he (and maybe his dad) escaped from SB in 1983, and he has returned to investigate further.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy