It is hard to stay consistent - but one of them with my teenage daughter is to say that if she stays with a friend, I always have to check it out with the parent of the friend.
I am fairly relaxed about most other boundaries but try to discuss things if questioned. I get really cross if my "no" isn't taken as final if I've explained why and there is still rebellion!
Why won't my 2 year old eat? 
How to cope with your child self harming
Sleeping issues etc for a 3 year old with possible autism - any help gratefully received 
First time mum issues with sons speech and language 
3 year old not sleeping through
