There's a feature on Marcel Theroux, eldest son of Paul Theroux, in today's Star (can't find the online link to that, but here's one from the Telegraph), and there's an interesting bit about what the effects of his father's book, "My Secret History", had on him. The book is an account of Paul Theroux's extra-marital affairs and understandably, it didn't have a good reaction with his family:
"Um… it was pretty tough. I don't think any account of one's parents having sex is something that a child would choose to read… Zero, frankly, is the amount you want to know about that… I did feel protective of my mother, but I didn't really resent it at the time because I bought my dad's line that it was fiction and nothing to do with his own life. However, I can't say I feel the same way now."