This was a thrown ball. Therefore for interference to be called, it would have to be intentional.
"Shove" ... sounds intentional, but remember, this was 10U.
A 10U player "shoving" another is probably just trying to avoid a collision, unless it was blatant.
It sound to me like incidental contact.
But, to your questions,
1) Normally I would have expected him to call interference immediately if he saw it, or to let the call stand unless you ask him for his input. Once he takes it upon himself to give you his input, it is still your call if you wish to make a correction.
2) BR is out before reaching 1st base (as Sam said), so no runs would score.
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Tom
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