Only children should get the opportunity to bubble with another family, for developmental and mental health reasons. How can it be OK for children not to have any opportunity to play with another child for what is looking likely to be 4 or 5 months. Single adults needs are recognised but not only children. It's essential the development of their sense if self, physical health, cognitive skills. Or even if two adults are meeting outside their children can come too, it doesn't have to be inside play or as formal as a Support Bubble.