To say Ron was nervous was an understatement. He had no idea how he was supposed to feel in a situation like this, let alone how to behave. He and Hermione had a daughter, who not only was their age but seemed to be rather defensive and unwilling to talk to them. That was something he couldn't get, possibly because he had been spoiled by all those nephews and nieces (Albus especially) reacting effusively when first meeting him. Well, that, and his reaction to a much younger Molly and Arthur had been a bit different - though, of course, that had been because when he first arrived he was in such a state he didn't care how old his parents were as long as they were there.
He knew he'd be there for Rose as well, no matter what, so her reluctance to talk to him took him a bit by surprise and, in true Ron style, he started to wonder if that meant he was a rotten dad. After a while, he found himself unable to write anything more than an "okay" because, really, what else could he say?
So it was with a heavy and worried heart that Ron arrived at the castle. Although part of him wanted to run away and avoid another shock, he kept walking towards the kitchen. No harm in a game of chess, right? he thought to himself. He didn't need to worry about the right thing to say or do while he was focused on the game.
He took a deep breath before entering. This was it.