Dnephew is 14. Middle and apparent favourite DC of DBIL. Every time we see them at some point DNephew sits on his dad's knee (getting difficult what with him being 14) or stands beside his dad and DBIL tickles his arms and neck with the tips of his fingers. He does it while chatting to someone else so it doesn't exactly interrupt what's going on iyswim but once it starts it goes on for ages.
It makes ne feel quite queasy and I have to look away. Of course when he was a toddler it was cute but now it just looks so wrong. I don't care what happens at home but in a restaurant, cinema etc AIBU to find it odd?