If nothing else, Tony had learned from his own father how to not be a parent; how to be an adult that was good with children, who knew not to talk to them like they didn't matter or that they didn't have valid opinions. Hell, talking to them at all was important.
Of course, Tony knew that there'd been a party -- Steve and Natasha both had gone to it, and he suspected they'd had fun for all they talked and giggled about it in private, now. There'd been drinking, he was sure, but not enough for anyone to do anything stupid and Tony wasn't the sort to police that sort of thing. "Sounds like it was a blast, I'm glad," he said with a smile. "And yeah. Don't worry about me. I have plenty of fun." It wasn't really true. Mostly he was stressed and missed Steve, but it wasn't like he was suffering either. He had Gwen and when all the kids went to bed, the adults went out drinking and sighing loudly, so there was that.
"Alright," he said, clearing the topic away because he didn't care to focus on it. "You wanna build some stuff?"