NORA Hyacinth: I think Nora and Hyacinth would be friends. Nora's non-threateningly dumb and she's not a leader type at this point in her life so she's not going to challenge Hyacinth's status in their social circle, even if her antics occasionally steal the spotlight. Aidan: They're in Broom Racing together, so there's that. Emilia: Both Gryffindors, and Nora certainly ends up injured often enough to rouse Emilia's mothering instincts. Oh, and they also share Cooking with Charms.
CAMERON Hyacinth: He will not take well to her spying, and they probably won't like one another just on general principle, so they can be enemies. Aidan: Not yet, but they will both be on the same Quidditch team. Emilia: IDK. Her social circle hangs out where his book club does. I just can't see them being at all interested in one another.
LOTTIE Hyacinth: They're both Slytherins and both in Choir, so they've got to know one another. If Lottie catches her being a total Parkinson, she's probably going to dislike her, but for the most part I think she's willing to give a 4th Year leeway. Aidan: Lottie is definitely his customer. At least for Astronomy, which is the only overlap there. She doesn't like troublemakers much but he's got dirt on her so she's willing to let him slide. Emilia: Prefect/Head Girl connection. Also, Lottie likes nice people.
KEZIAH Hyacinth: Cousins, fond of her, might use her for intel if necessary, etc. Aidan: They're in the same year, she gets along with Maura, Aidan's in Basil's social circle. There's no way they don't know one another. He probably annoys her a little but she bites back on her annoyance because his dad's famous and that might be of use to her. Emilia: They're both in Gobstones Club together, where Keziah's actually the boss of her.