My niece is 2yrs 4 mos and is rf in a Radian 65 with old style chest clip (if that will make a difference). My sister has noticed her car seat being unbuckled a couple of times and thought maybe her 7yo did it. But then she started complaining that she undoes the chest clip. Then she revealed that she was taking the straps off her shoulders. So here's what's happening. Seh is undoing her chest clip, taking her shoulders out, and unbuckkling her car seat. I asked my sister why she didn't use LATCH. She said it won't install tightly with LATCH. 2003 (maybe!!) Tahoe. So she said she was going to buckle the LATCH, then install tightly with the seat belt. I told her I'm sure there's a fix for this. So help me think of what we can do here. What can we do to stop her from undoing the chest clip? She doesn't know she does it until they get to where they are going. Solve that and we solve the other issue too!! Thanks.