Janet Jackson says being a mother is the “most important thing” she’s done with her life. The 58-year-old singer is mum to seven-year-old son Eissa Al Mana, who she has with her husband Wissam Al Mana, 49, and has now opened up about how the child has had a “beautiful impact” on her life. She told The Guardian: “The most important thing I’ve done, the biggest thing I’ve done, is become a mother, and it’s had a beautiful impact on my life. “I wanted to have three children, but thought, ‘I should stop there, that’s probably all I can handle.’ Because you have to give all of yourself. “Obviously,…