Andrew is clearly uncomfortable at even describing Jack as his child. If he could, he'd reassure Alec that although Jack is biologically his, he sees Alec as being much more his, because he raised him. This strange small child is an interloper in both of their lives, and he's starting to realize that this may be more difficult than he'd hoped.

"Her name is Jasmine. She was a dancer and an aspiring actress. You may have met her one or twice."