Kids obviously come first but for everyone's sake isn't it better you fulfil one of your dreams instead of putting it off and telling your children/grandchildren of the great plans you had instead of the amazing trip(s) you went on? A life lived in regret is not a life lived (or something!)
Use it as an excuse for them all to fly out and meet you in some exotic location for summer/winter hols...
Regarding the work aspect, are you seriously thinking of RTW for the rest of your days - if so, fair play but I think after a while you may want to come home and work again. I've had four days off in the last three years of work and I feel like jacking it in tomorrow. However, in my heart of hearts I know that after being away for months/years I would at some point want to change my environment and come back.
Your drive to build a business may need nourishing again in the future as much as your wonderlust needs fulfilling now  - just a thought...
MS
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