Neville and ?
It was difficult not to stay close to Hannah, especially when he suspected she was feeling quesy. On the other hand, he didn't want to be one of those overbearing husbands; a fine line to walk.
Quietly, he kept an eye on her while giving her space to meet the other members. Neville had a lot to absorb himself; not least of which was Lucius Malfoy's death. For all the intervening years, the first and most vivid memory of the man was that night at the Ministry. All others were secondary. He couldn't make himself be a hypocrite and mourn the man, even though he was sorry for the Grandson's loss.
Casting an eye out for Hannah and watching for a signal that she wanted him or wanted to leave, he mingled, curious about the faces that were new to him.