I have two sisters, and I think siblings are always going to be irresistible for novelists. They have been throughout time and they'll continue to be.

There was so much anti-Irish sentiment not just from other kids at the school I went to in Britain, but also the teachers themselves. I remember very clearly a lot of the things people said to me and my sisters. And of course those sentiments go back a long way. When my dad visited London in the 50s and was looking for somewhere to stay, there were signs outside boarding houses that said "No blacks, no Irish."

Despite being from Ireland, I've always avoided writing about it, for two reasons. For a very small country, Ireland has produced an astonishing number of literary geniuses, and at some level I probably never felt, having left as a toddler, that I had the right to try and add my voice. That's part of it. But I also didn't want to write something that was the equivalent of the Irish theme pub. You find them all over the world. The idea of producing a novel that might replicate that type of ersatz really set my teeth on edge.

Something that had an enormous influence over my relationship with language was my stammer. I had a really bad stammer in my childhood and adolescence, and that imbues you with two things. First, a hyper-sensitivity to grammar, because a stammerer will have problematic sounds, impossible verbal stumbling blocks. Second, writing is just such a joy when you have a problem with speaking. It's so astonishing to watch language coming out of your pen without any hesitation or dysfluency.

I was interested in the ripples of feminism passing through Britain and Ireland in the mid-Seventies - how the reverberations of the feminist political movement were being felt in suburban households. So many novels end with a marriage.

She wanted to say, no. She wanted to say, I have a son, there is a child, this cannot happen. Because you know that no one will ever love them like you do. You know that no one will look after them like you do. You know that it's an impossibility, it's unthinkable that you could be taken away, that you will have to leave them behind.

She liked the way his smile took a long time to arrive and just as long to leave.