@KERALA1
You can have a good close relationship whilst maintaining the parent child dynamic I think. That's optimum surely.
The "friends" thing conjures up lack of boundaries and guidance (poor lemonade above) or cringeworthy Ab Fab "hanging with kids" clinging to your youth behaviour.
I disagree. It is perfectly possible to be friends with your children. I don't mean 'hanging' with them PMSL. (Like going to the pub and getting pissed with them and their mates, and intruding on their movie nights, and trying to muscle in on their videogame afternoons, and joining them in their internet chats!)
I mean, just chatting to them like I would my friends, (about life, politics, current affairs, people we know, and work etc,) meeting for lunch, going away for the weekend with my daughter (just me and her,) and her dad and her going to a concert together. Getting together for an afternoon clothes shopping, or trawling round the charity shops in a tacky suburb of the city. That is what I mean, and that is what it means to be friends with your children.
I don't know ANYone who tries to get down with the kids, and BE one of them. 
Does anyone actually do that?!