These people have perhaps had some discussion around the dinner table or some news item or whatever has brought it to their attention and they've made the decision as a family, or they understand what each other's wishes are.
Il se peut que ces gens en aient parlé lors d'un repas ou à l'occasion d'une nouvelle ou autrement, et la décision a été prise en tant que famille, ou encore ils comprennent les voeux de chacun.