No. Your grandson and the 13 year old are both too young to give legal consent to ANY sexual activity. This includes fondling with clothes on.

Can a 15 year old date a 12 year old?

No, it is not illegal due to just your age difference. It only becomes illegal when there is sex involved, the person you are having sex with is under 16, and you would be either 1 )four years older but less than eight years older than the complainant

At what age should you get a girlfriend?

So when it comes to dating, how can you prepare yourself to deal with potential questions and issues? And what age is appropriate? The American Academy of Pediatrics notes that on average, girls begin dating as early as 12 and a half years old, and boys a year older.