It would seem to go against the romantic nature of a couple to feel a thread of connection when babysitting, but it can bring back pleasant memories from when they were younger. When they are watching the grandchildren, their experience as parents makes it easy to keep control of the situation. Children generally get along with them much better than they do with their own parents, so there is harmony among them. It might be difficult for many people to believe, but memories of the past can make a couple struggling with an empty nest find their lost connections.
Parents often feel overwhelmed when raising their own children, so it is often where couples begin to lose their romantic connection. They are busy instilling manners and discipline, and they often find the noise level makes conversation with each other impossible. The continual interruptions and needs of their children come first, and even regular date nights are unable to compete. Romance eventually falls by the wayside, and the adults are often eager to just get through the day and night so they can sleep.
The raising of children contains many incidents that are upsetting at the time, but watching grandchildren go through the same motions can bring a feeling of nostalgia. The missing shoe incident might have been wrenching when considering the family budget, but it now makes a couple look at each other with smiles. That type of connection will help bring others back, and that is how their new romance will begin.
Few adult relationships remain unchanged by the long years of raising a family, but the differences are not all bad. Some of those struggling with an empty nest might find their connection through a hobby or interest, but others will find their own connection through reliving the memories brought on by spending time with their grandchildren.