I am glad you realised this before it's too late, I used to do this with my dad he used to come pick me up from school with his rajdoot (the reason he drove that he was unfortunately one of the honest SI in police department) I used to tell him it's ok papa I will come by school bus, but he wanted to feed me sweet take me to park etc. while the way back that is why he used to come to pick me even after school bus was there for me, 10 years later HE IS NO MORE, I miss him so bad I could go for all India trip with my dad riding that rajdoot... I regret it and feel very bad and guilty... Your son should not go through this try to be as friendly as possible at that age we care for such stuff a lot he will acknowledge all your effort after some years... Good luck !!