I dont think so, i think they prob got seperated aka lant took sierra away and when he saw the child, either after birth or the child being a toddler. He tried killing him but the child still survived with the help of sierra.
And also if you wondering why I just didn’t make roxanna’s real parent izek and ruby/sierra is because of the eye color, it wouldn’t make sense if Roxanna’s real parents is ruby and izek if her eye color is red right? I mean izek doesn’t have the color red nor ruby too.