Liam came out of the car and held out his hand for his mom to come out; Catherine stepped out and clung to her son's arm.
It's been so many years. Seventeen long years!
After her mission failed and she couldn't get the Howells Corporation for her son, she had to take him away and change his name. His name was Michael but she had changed it to Liam to protect him.
And after sending him away, she adopted a son, of the same age and named him Michael. So everyone thought he was her son, and the heir to Warren Corporation, and that was what she wanted. She needed to protect Liam from anyone who might have known about her plot.
If she had succeeded in killing Nicklaus, it would have been easy to get into the Howell Family and have the Howells Corporation with a simple blood test, but he was alive! He was fucking alive! Up till that moment, she still hadn't figured how he managed to escape from her grip.