Ronan Keating is loving being a grandfather and has hailed his son Jack a “great” dad. The Boyzone singer, 47, has heaped praise on his 25-year-old former ‘Love Island’ star offspring for being a natural parent to his newborn daughter Maya He told OK! Magazine: “It’s all wonderful, it’s lovely. Maya is a beautiful baby girl and Jack is doing great. “Jack’s a great dad and he’s doing really well.” Ronan is father to Cooper, seven, and Coco, four, with wife Storm, and has Jack, Missy, 23, and Ali, 19, with first wife Yvonne. Jack surprised fans by announcing he’d become a dad last March. He went…