Maksim Cmerkovskiy’s son was unfazed after learning that he would be getting a sibling. The 44-year-old choreographer – who has Shai, seven, and eight-month-old Rio with his wife Peta Murgatroyd – has revealed that his eldest son was unmoved when he was told that Maksim and Peta are expecting another child. Speaking to US Weekly, Maksim shared: “He was like, ‘Great’, [and] kept it moving. “It’s how’s we present it. If we present in a neurotic, ‘Oh my God, what are we going to do?’ [way], he’s going to have that reaction.” The ‘Dancing with the Stars’ performer has also revealed Shai is unlikel…