Jack Nicholson‘s kids are opening up about the man behind the shades after the famed actor decided to step away from the bright lights of Hollywood. Nicholson, who has six children from five relationships, has largely retreated from public life since his last film role in 2010’s How Do You Know?. In his absence, his kids — Ray and Lorraine Nicholson, namely — have been offering new insight about their dad. Jack shares Lorraine and Ray…