I was an only child so feel like I have no reference for this behaviour as to how “normal” it is.
I have a 13, 14 and 15 year old.
I have noticed that my middle child can be quite manipulative with her siblings to get what she wants.
For example she doesn’t want to sit in the middle of the back seat on long car journeys. The others are willing to take turns but I’ve now found out my middle child will get some gossip on their sibling and use it to their advantage. So will say if you don’t sit in the middle I will tell mum you’ve done x y and z.
Or if you don’t buy me sweets, chocolate etc then I’ll tell mum about whatever.
I’m only aware of this because I was doing some random phone checks re their social media use which they know I do due to some problems in the past.
Should I intervene or just let them get on with it?