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John Stamos, 57, holds son William on the child's third birthday
John Stamos has a special bond with his son William 'Billy' Christopher whom he shares with wife Caitlin McHugh.The 57-year-old Full House actor shared several images to Instagram with his mini me over the weekend to celebrate the boy's third birthday. As the images flipped, the Beach Boys song God Only Knows could be heard.'I can't put into words the magnitude of the love I feel for this little guy,' Stamos captioned the video.