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Query: SELECT c.familyID, p.personID, p.lastname, p.firstname, p.birthdate, p.birthplace, p.living, p.gedcom FROM tng_children AS c INNER JOIN tng_people AS p ON p.personID=c.personID INNER JOIN tng_children AS c2 ON c2.familyID=c.familyID INNER JOIN tng_people AS p2 ON p2.personID=c2.personID WHERE (p2.birthdatetr=p.birthdatetr OR p2.birthdatetr=DATE_ADD(p.birthdatetr, INTERVAL 1 DAY) OR p2.birthdatetr=DATE_SUB(p.birthdatetr, INTERVAL 1 DAY)) AND YEAR(p.birthdatetr)<>0 AND MONTH(p.birthdatetr)<>0 AND DAYOFMONTH(p.birthdatetr)<>0 GROUP BY c.familyID, p.personID, p.birthdatetr HAVING COUNT(c2.familyID)=2 ORDER BY p.lastname, c.familyID, p.birthdatetr LIMIT 50