I am!! I would love for Roderic to be the younger brother of Leo, especially if he was taken in shortly after being pulled out from the former family when he was around eight or so. Leo's mom sounds so sweet and them being mechanics actually works perfectly considering his skills and his own background of being a mechanic in his world. He probably would have been shy around the early months of the adoption but warmed up to them soon enough.

Definitely enough to have him try and tag along with Leo, if he allowed that, and tried to be helpful/proactive/cheerful while they were together.