Based on all the helpful responses above, and considering the topical question, would it be final to say that for the purposes of the GV:
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Children who will continue to be minors after 5 years should be left off the GV as other forms of citizenship can be applied? 
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Children who will be majority age after 5 years should be added onto the GV as few alternative forms of citizenship paths exist, particularly simultaneously with their other family members? 
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The Spouse can be left off the GV as long as s/he can wait a minimum of 3 years or up to 5 years? (Have we really answered the timeline question of whether it’s 3 (or 5) years of marriage overall or duration of marriage to a Portuguese citizen)? 
Also, does scrolling down on this link suggest that Portuguese community links examples are as simple as:
- Visits to Portugal (photos)
- Receipts from hotels, restaurants, medical bills, airlines
- Portuguese clubs or Associations in US
Thanks! 