United Kingdom, Oct. 6 -- Lukas Gage's memoir made his mom think she had "failed as a mother".

The 30-year-old actor has addressed his older brother's heroin addiction and his mother's obsession with casino slot machines in I Wrote this Book for Attention and he admitted it took reading the tome for his parent - who largely raised her three sons alone - to realise the impact her habit had had on the family.

He told The Guardian newspaper: "She talked to my other brothers, like, 'Do you guys feel this way too?' And they were all like, 'Of course, we've been saying this since we were kids.'

"[After reading the book] she felt as if she failed as a mother and I did not want her to feel that way whatsoever. I feel like even though there's t...