Cepheus reminds you that his name is CEPHEUS, not Ceph tyvm and he will never answer to a shortened version of it. Call him it enough and he will rip out your throat and keep on going. Cepheus spends a lot of time going back and forth between his parents and learning their respected jobs so I imagine he and Mal have interacted quite often. Cepheus is polite to Cissa but only because Bella would MURDER him if he ever dared to be a shit to her sister and Cepheus does not like disappointing his mother. Cepheus needs more friends so he welcomes hanging out and being "friends".
Berga is good to Orla. Oddly enough, she's good to all of those who work for her, she just doesn't show it all the time.
She's an Auror in England so I'd imagine they'd interact quite a bit. LOL flirt away! Lena will happily flirt back.
Fabin's kiddo is married to one of Jacen's, right?