In case of parents well its different for obvious reasons, but in any other case I am not comfortable with idea of touching feet and bowing down.
The act of bowing down in front of other humans ....... was it initially done as an act out of respect and became culture or was it adopted latter from an act that was initially done as an act of submission? Courtiers and commoners bowing down to Kings and queens .......... that showed who is superior and who is inferior.
There is a difference between a human who is both humble and free and a human who is supposed to bow down to show his humbleness to other similar humans.
@Levina