Shaykh Abdul Azeez ibn Baaz rahimahullaah was asked:
Q: Before I go to school in the morning, I kiss the head and hand of my father and mother. Is there any harm in that, in kissing the hand of ones father or mother?
A: There is no problem in that inshaaAllaah; however leaving that some of the time is better. Not always, sometimes. Otherwise there is no problem with that.
[Source: http://www.binbaz.org.sa/mat/9486 ]