Sentence:  Therefore it 's a genuine pleasure to tell you about an entirely happy bodybuilder who has never had to train in secret ; has never heard one unkind word from his <WSD>parents</WSD> ; and never has been taunted by his schoolmates ! 
Meaning of the word marked with <WSD> tags:  a father or mother; one who begets or one who gives birth to or nurtures and raises a child; a relative who plays the role of guardian