Serena Williams is “obsessed” with her children. The 42-year-old sporting icon retired from tennis in 2022, and Serena is now firmly focused on her family life. The Grand Slam-winning star – who has daughters Olympia, six, and Adira, nine months, with her husband Alexis Ohanian – told ‘Extra’: “They’re like my biggest love, so I’m obsessed with those kids.” Asked about the adjustment of going from one child to two, Serena replied: “My baby kept saying, she’s like, ‘I want a sister! I want a sister!’ So, that was also a lot of pressure – is it gonna be a girl or a boy, you know? But no, I alway…