I tell my students you have an absolute right to write about people you know and love. You do. But the kicker is you have a responsibility to make the characters large enough that you will not have sinned against them.
“If I'm at home for the weekend - and that is almost never - I tend to get twitchy at about eight o'clock in the evening because my body clock is timed to go on stage. I don't know what to do with myself.”