John Travolta has shared a rare photo of his youngest son Benjamin, ten, over the weekend to reveal some happy news in their family.MORE: John Travolta returns to social media to thank fans for their supportThe Grease star took to Instagram to post a gorgeous photo of himself with his little boy, who looked delighted as he cuddled up to a fluffy white cat.In the caption, John wrote: "Ben's new cat Crystal." Fans were quick to comment on the sweet news, with one writing: "Crystal has found a