Is kissing family members on the lips wrong?

My grandmother was the only family member that I kissed on the lips...nothing sensual or sexual just a peck on the lips. I see nothing wrong with that. I loved her and she loved me, the kiss was an affectionate expression of that but nothing more. I have seen other people do that...mother's and children, fathers and children, grandparents and grandchildren, aunts, uncles, cousins. brothers and sisters...I always thought it was sweet. A little common sense and not jumping to conclusions and it is harmless. You can tell the difference in simple affection and anything more. Not everyone is comfortable with it, but that doesn't make it scandalous or wrong for everyone.