Answer:
A father's child, a mother's child, yet no one's son
White and thin, red within, with a nail at the end. What is it?
The more you have of me, the less you see. Who am I?
Gumby and yoga instructors have this in common.
When it's dirty this should never be aired in public.
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?