Mentioned this earlier but NCd and come on here.
DS is 3. From an early age he’s been able to get his arms out from the straps from the car seat meaning that it’s pretty useless. I bought this and a Houdini strap, he can still escape though 
But in DHs car it’s actually really unsafe. I don’t know the brand as BIL gave it to DH but have attached a photo - ds is all over the place in it. Houdini strap makes no difference as ds just shoves it down and gets his arms out.
Can anyone recommend a safe car seat for a serial escapee, please?