Ultimately, what OPs asking is a very specific question needing answers from people who have genuine experience with the various challenges that come with a large and young family and for which there are genuine ultralight "paradigms" (in OPs words) that are useful here, but for which the standard weight-only focus is not the best, as there are some specific things that come with kids and large families that need to be taken into account, especially when you have two kids 5 and 7
We spent one morning on the bass boat, where the most exciting thing that happened was that a duck followed us for quite some time
Unlike other line spoolers, these line spooler tools allow the line to unroll from the filler spool and directly to the reel without any line twist
Moreover, look for a padded hip belt and a chest (sternum) strap
If you want an all-around rod to cover some of the "bonus" species you might encounter in Brazil or Bolivia such as pacu, arowana, yatorana, and more, a fast-action 8-weight is ideal