As a Dad, I can tell you that I never think of my little girls as anything other then my little girls. That is how I see them in my mind, that is how they always will be, however, I am able to express opinions, but, not in the form of demands, just more like suggestions. Sometimes they take my advice, sometimes they don't, but, they always know that I love them more then life itself and that, if pull came to shove, I would always be there for them. Unconditionally!
In the long haul, they know that I respect their intelligence and ability, but, I do find myself as a sounding board quite often. I had to learn that sometimes all they wanted was a loving ear to listen to them and have their back, not to solve their problems for them. That does mean that on occasion you have to, as nicely as you can, tell them that you think they are wrong too. It still goes on even though they are both in their 40's now. They also provide an ear for me to speak to as well. Adult relationships with your children can be extremely rewarding. I loved them little, but, it is so much more rewarding now that we are all at adult levels. They also begin to appreciate just how difficult being a parent can be. I realize now that in many ways parenting doesn't stop when they move out. I also realize that there is a point when we go from care giver to being cared for. That's going to be the hardest part for me.