The morning of the twins' birthday, Dark and Daizi had added a few decorations to the inside of the house. It wasn't necessary, of course, but they thought they might like to see them as soon as they woke up in the morning. Although, yes, they had only been the twins' parents for two years, they still couldn't believe their children were seventeen. It seemed so much older!
At the party itself, they had brought a small baby pen so Ivy have a more contained, quiet space for her, since the new, bright, likely loud environment had a high chance of being overstimulating for her, and since she was going to be there for so long, it only made sense to provide her with a space where she had her toys and some sense of familiarity. Although after it was established... Dark realized it did kind of look like a a petting zoo. And this... Well, he couldn't deny it made him laugh, so he took one of the pages Alec had set up on the easels and quickly made a sign which said as much, including a warning about how she may bite. Of course, Ivy wouldn't be forced to stay in her enclosure.
They had also set up a small gift table for the ease of the guests, and waited to greet their sons' friends as they came in. As always, Daizi was much warmer than her husband, although he did seriously try not to be cold. Unless it was requested otherwise, neither of them tried to hide their alternative fashion senses, but they did make a pointed effort to dress down a little bit purely to not "outshine" their sons, or at least not Alec. It was their birthday, they deserved to look the best.
Milo arrived without being the last one there, for once, and he first took a few photographs of the venue itself before saying hello to Dark, Daizi, and Ivy before greeting Alec and then going over to Xander to congratulate him. "Happy Birthday," he said, looking around the space, "The party is really cool. I like the, uh, split theme. It's neat. And the petting zoo made me laugh."