Prince William is a pillar of strength for Kate Middleton as she receives cancer treatment.
“He is a very reliable, strong person. She doesn’t feel isolated in this because of William, who is right beside her,” a longtime family friend exclusively tells PEOPLE.
The Princess of Wales, 42, said in her video message announcing her health news that her husband of nearly 13 years is “a great source of comfort and reassurance.”
“This is about supporting her and her feeling supported. It is a joint effort. She doesn’t feel isolated at all,” the insider says. “The nuclear family that they have created so well is an immense support not only to him but to Catherine too.”
Kate’s parents, Carole and Michael Middleton, have been an additional source of help, with Carole accompanying her daughter on the children’s school drop-offs. Meanwhile, the royal’s siblings, Pippa and James also live nearby. James shared a touching statement on Instagram accompanied by a throwback photo of himself and Kate as children when Kate shared her news, writing, “Over the years, we have climbed many mountains together. As a family,we will climb this one with you too.”