At the sudden declaration that she had a sibling named Elbert, Maisie quirked a bit of a confused face, "I don't have anyone in my family named Elbert," she said, though the name was ringing a bell...wait. This was him. This was the one that wouldn't leave Ellie alone about her name!
"Wait, do you mean Ellie? Because she's my sister. That makes you Niki, right?" No wonder she had thought something was off.
If she remembered right, something had happened to him in the final battle. The Niki she remembered had always been hanging around with his cousin Braxton up until he left school, then he was still just...another Slytherin. She never thought she'd be discussing Bertie Bott's beans with him.