yeh, thats my struggle.
she said she can afford a GN (one) this month and can get another one next month. this isnt an ideal situation but i have suggested putting the higher weight child (which just so happens to be the younger child).
i have heard the GN is hard to get your hands on....im not sure.
so is there anything to prevent them from unbuckling the chest straps?
I think if you do a search you'll find some posts about chest clips and stopping kids from undoing them and/or sliding them out of position. (It's late or I'd search and put some links here for you.
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So far as the safety aspect, if the harness is properly tightened them unbuckling the chest clip itself isn't really much of a big deal. She needs to be firm and rebuckle them, but it's important to keep in mind that it's a prescrash positioner - if a harness is tightened properly, it shouldn't be moving out of position in a collision.
You said she has cosco seats, and cosco harnesses are notoriously bad for being twisty. If they're twisted up like I've seen so many of them, they might just be hurting her kids legs because of that. Or maybe their pants are caught and bunched up? Or maybe the kids are just complaining if other comfort issues are ruled out...
The other issue of concern is that it's likely that the kids have outgrown the seats by height in terms of the harness anyways, so there's problems on a multitude of levels. The question is, what will keep her kids the safest in the interim...
Is having an adult sit in the back seat an option? Use an adult back there in combination with some sort of reward system for them staying buckled or leaving the chest clip alone etc. I think that if that's possible, the kids would be better in a booster buckled up, then in a harness that's too loose and they're over the weight limit of. As it stands right now, they're not really safe any way you slice it... too loose harness, undone chest clip, outgrown by weight and possibly height... it's a combo of things that is just a really bad scenario. If she can address them undoing the seatbelt, then it's just one factor to deal with until she can get seats that they fit properly.
OTOH, if there's no way to get them to stay buckled in the seatbelt, then I guess the carseat is the lesser of 2 evils even with the huge misuses until she gets them replaced.
Hugs to you and to her. You're a super friend for trying to help her out with this - and it's wonderful that she's looking for answers and trying to get help. Asking questions is always the first step on the path of learning stuff, so she's headed down the right trail anyways, even if it is a long one for her and her kids.