This is how I see their family dynamic.
Matty: Is the Mum
Jack: Is the overprotective dad
Riley: Is the only girl so she gets a lot of attention from Jack
Bozer: Is the forgotten middle child
Mac: Is the favourited youngest child that everyone loves and is protective over (But mostly by Jack)
Basically Matty and Jack are divorced parents Jack had custody for the most part and now Matty is back and they're working on being co-parents but not getting together.
As for the sibling dynamic it's clear that Jack pays more attention to Mac and Riley. I'm not saying Riley is the oldest or that Mac is younger than them it's just how I see their sibling connection.
Mac and Riley are basically the same age but Mac ultimately gets more attention than Riley making him the youngest child and since Riley is the only girl she gets more attention than Bozer who no one really pays attention to so he's basically the middle child who doesn't get noticed as much.
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Mac's Found Family
RandomI really love Mac and decided you know what I'm gonna do some found family incorrect quotes. If you'd like to know the fandom is MacGyver which is a series on Stan.