I don't do aerobatics, so I'm not entirely sure how well that prepares you for a cross-country VFR flight with your family.
Flying aerobatics is completely different from VFR touring. So learning to become a (better) aerobatics pilot does nothing for your touring abilities.
But having said that, to become an aerobatics champion you've got to travel to competitions all over the country, or even all over Europe. Typically in an aircraft that's not too stable (it's aerobatics after all), has very limited cockpit space (most are tandem or single seat) and has a very limited panel/avionics.
So I would expect that an aerobatics champion has extensive experience in doing VFR touring.