Notifications can be managed in browser preferences.
Please refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in
While her wild younger brother is a feted household name, Gwen John is hardly known. But a fascinating new book, which unravels their story of mutual torment, shows why this neglected sibling was the true talent and should now take her rightful place in British art history, writes Robert McCrum
Please refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in