Both DH and myself work part time for our DS so we are in almost daily contact but mostly about things we need to do for him. It's nice when he phones just for a family chat about once a week.
If there are any problems with the family we are first to know. 
We don't phone him unless there is an emergency as I am always worried I will be interrupting them.
Would you think it was odd if a younger person wanted to befriend you?
‘The ‘professionals’ - finally finished, phew!
? I didn't even get bloomin' Christmas. No ones getting a cream tea from me [except me]
!