Who are Maxwell's siblings? The Maxwell siblings, from L-R: Anne, Kevin, twins Isabel and Christine, Philip and Ian with Ghislaine. (Realghislaine.com) Maxwell is the youngest of 9 siblings, out of which, seven are still alive – Anne, Philip, twins Isabel and Christine, Ian and Kevin. Philip Maxwell, 71 Phillip Maxwell, a scientist and a mathematician was known to have been brilliant from a very young age, seeing that at 16, he won a scholarship to Balliol College, Oxford. However, his strained relationship with his father went from bad to worse when he married Nilda, an Argentinian in 1977. Daily Mail reports that after two failed marriages, he now resides in North London and currently is a writer.