Coincidental Birth Date Numbers

Because you did not give permission to publish your sons' birth dates, they were removed from your question. For those reading this response, the month number of each son's birth date is the same as the other son's day number.

All dates have meanings in the sense that the date represents certain numerology energy that can be interpreted.

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But traditional numerology has no calculations for subjective meaning or significance of coincidences. There may be meaning there, but not a numerological meaning.