Hugh Grant's Brother; A London Story

A friend e-mails:

I met Hugh Grant's brother at a dinner party recently. Very nice, also good-looking, a banker working now in NY, the older brother. What's it like? I asked, having a kid brother who's world famous. Rather fun, he said, then told me that his mother, at a dinner party in London, was asked what her children did. Oh, one's a banker and one's a film star, she said. Really, how interesting, the other guest said, which bank?