Kissing Games of the World by Sandi Kahn Shelton

Single mom and artist Jamie McClintock and her son, Arley, share a home with Harris Goddard and his grandson, Christopher. Harris has been raising Christopher since he was an infant, after his mother died in a car accident and Harris' son, Nate, left. When Harris dies of a heart attack, Nate comes back to the family home to claim his son. Arley and Christopher are kindergartners and best friends who do everything together. Jamie fears that Nate's return will be the end of the boys' friendship and also of the closeness that she feels herself for motherless Christopher. Nate is immediately suspicious of Jamie since she's around his age and wonders if Jamie and his father were ever involved. It also doesn't help that Harris and Nate never saw eye to eye and that Harris walked out on Nate and his mother when he himself was a child. When Nate announces his plans to sell his father's house and have Christopher join him on the road with his job, Jamie feels her heart break. Jamie also worries about not having anywhere to live and Nate's clueless parenting skills. Both Jamie and Nate are attracted to each other yet get on each other's nerves. Will they go their separate ways or learn they need each other?