If he hasn't learned it yet, then he'll learn it soon enough. Thomas wasn't the sort to hide his intentions when it came to Eli and he'd be transparent for Shannon as well as long as he was still dating his son. It was only polite and he thought it'd gain points with Eli, despite the fact that Eli still has yet to forgive him for everything.

"Fine, I'll start knocking if that'll make you happy and if it'll keep me from seeing it again." Now that this seemed to be taken care of at least in Matheus' eyes, he shifted the conversation a bit. "So, how long? I didn't think you were that kind of guy."