It would make sense, except that as far as we know, Ben's mother died at childbirth, which ended up being a hang-up for Ben and his father. Locke's mother was still alive whenever Deus Ex Machina's flashbacks took place, and they were certainly after the 60s. The ages don't really match up either — Locke's 48, so that puts Emily Locke at 16 in 1956, and Emily Linus looked way older in what
looks to be the early 60s.
Otherwise I'd probably be in on this theory too.

I think I'm just putting it down to a weird coincidence that their mothers are both Emily L.
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