Sir Mick Jagger 'to become great-grandfather' Sir Mick Jagger is to become a great-grandfather, his family has disclosed. Sir Mick's granddaughter Assisi, 21, is to give birth in the new year, his daughter and Assisi's mother Jade, 42, said. In an interview with The Sunday Times Style magazine, to be published next week, Jade confirmed that he was now set to become a great-grandfather, saying: "It is true. I am going to be a grandmother. However, she suggested that this latest milestone for Sir Mick, whose band has just announced a new show in 2014, was unlikely to slow down the pace of his lifestyle. "I think making Mick a grandfather obviously had a big impact whereas, now, making him a great-grandfather is no longer particularly fascinating," she said. In July Sir Mick celebrated his 70th birthday party with family members and friends at the Loulou private members club in Mayfair. The celebration followed a series of concerts played by Sir Mick along with Charlie Watts, 72, Keith Richards, 69, and Ronnie Wood, 66, to mark the band's 50th anniversary. A show at Hyde Park in London on July 13 was thought to have been the finale of the tour. But last week the band announced a concert in Australia in March which would continue the "exhilarating celebration" of its five decades. The disclosure that Sir Mick is to become a great-grandfather comes after his former wife Bianca admitted that the pair's marriage had been "very challenging." In an interview with the Telegraph she warned that she would not waver from her policy not to discuss Sir Mick. However, asked if she would ever marry again, she replied: "My marriage - it was very challenging. I feel very apprehensive about embarking on another serious relationship. It's not one of my priorities.