DS is 16 next month, v sensible and I wouldn't worry about leaving him overnight for one night haven't done it before but I'd be happy with it, as would he).
But is it ok for me to leave him in charge of his sister too? She is 11. Whilst I feel that they would both be fine with this, I'm not sure if it would be fine for me to do this...or really bad parenting 
Is it ok????