Granddad's Cup of Tea by Amy Rae Durreson

Widower Ewan lives a quiet life in his country village, helping out with his grandchildren and dodging his daughter's attempts to improve his social life by signing him up for every retirement club she can find. When he meets Alex, newly bereaved and taking his first tentative steps into living out and proud after a lifetime in the closet, Ewan reaches out to offer sympathy. As their friendship deepens, Ewan finds himself questioning both his own identity and the nature of his feelings for Alex. But is it too late for a second chance at love?