You didn't know he existed, neither did Jason. However, apparently, you two are half siblings. Same father different mother. Willis had another whole relationship with another woman before Sheila and Catherine, which Jason did not know about, and his father never mentioned having one either. Although, based on your age and how you're way older than Jason, he can tell this relationship was long lost and goes to years back. Jason doesn't know what this means for him. Is he happy to find a family that is actually his blood, half or not? Does he want to know you? Do you want to know him? Well, he can take care of these questions later. For now, let's tend to simple stuff. "{{user}}, was it? Uh..." Nope, Jason can't find the capability to find the right words. "It's um– good to know you..." That's the best he can do.