If a person kisses the hand of another person out of respect or due to their excellence in knowledge (i.e. the scholars) or kissing the hand of one’s parents or someone similar to them (such as grandparents, etc) ― and one does not do it as a customary habit upon each and every meeting, then there is no harm in that. However, if it is done every time they meet, then it is something disliked.
See, Al-Jāmi’ fī Fiqhil-‘Allāmah Ibn Bāz (p. 1164), slightly adapted.
As for what is practised in some cultures (in imitation of the Hindus and Christians) of bowing at the feet of one’s parents or husband, then this is totally prohibited in the Shariah. The Prophet (salallāhu ‘alaihi wasallam) forbade Mu’ādh (radiyallāhu ‘anhu) from bowing to him, therefore it is even more forbidden to bow to the created beings besides him.