For both girls, I think Gemma would be your best bet. She would cross paths with Hermione at work, and be nice to her. Plus Gemma has a five year old, so she's part of the parent crowd.
As for my others? Julian would be nice to them both and maybe they can have him do their hair? Lee loves them, obviously. I don't think I can offer much with Will. As far as Jordan? He would talk with Fleur, especially about France. Sadly, Hermione rubs Jordan the wrong way (even though she wouldn't know about the Family as they are like Fight Club, their politics are also far too different).