Mr. and Mrs. Granger might be curious. They've heard so much about the wizarding world from Hermione, and Draco is a big part of that world. So they may ask him a lot of questions right away.
They could be shocked by his appearance or manners. If Draco still has some of his old Slytherin style, it might seem very different from what they are used to in the Muggle world. For instance, his formal way of speaking or his elegant yet somewhat haughty bearing could catch them off - guard.
In a lot of these fanfictions, the meeting can be quite awkward. Mr. and Mrs. Granger are not used to the wizarding world's ways, and Draco represents a part of that world they don't fully understand. Draco may be nervous because he wants to make a good impression, especially if he and Hermione are in a relationship. He might bring a gift for them, something from the wizarding world that they find both fascinating and a bit strange.
One possible scenario could be a tense encounter. Mrs. Granger, being Hermione's mother, might be initially very suspicious of Draco. Given their families' past differences in the wizarding world, she could be cold towards him at first. But Draco, trying to prove he has changed, might be polite and respectful, which could gradually thaw Mrs. Granger's attitude.
Draco's character might develop a sense of responsibility. Meeting Mrs. Granger makes him realize that he is not just in a relationship with Hermione but also has to be acceptable to her family. So he starts to be more accountable for his actions and words.
For the Weasleys, they could be excited to meet Hermione's parents. Arthur Weasley might be especially interested in learning about muggle things from the Grangers. The Grangers may be a bit overwhelmed by the Weasleys' boisterous nature and the presence of magic, but they would also be glad to see the family their daughter is so close to. They might start to relax as they see how kind and inclusive the Weasleys are.
They might be horrified. The Dursleys are very set in their Muggle ways, and magic is completely foreign to them. So, seeing the Potters, who are clearly magical, could terrify them.
At first, Bellamy might feel a bit of anger. Maybe he's been through some tough situations on the Ark and blames Clarke for not being there. But as they start talking, that anger could turn into understanding. Clarke could explain her side of things, and they could start to rebuild their friendship. And then, they might both feel a new sense of hope, knowing that together they are stronger and can face whatever challenges the Ark has to offer.
She could also get angry. Hermione is a passionate person, and being left for someone else would surely stir up her emotions. She might lash out at Draco or even Astoria, especially if she feels that Astoria has somehow manipulated the situation. However, she is also a rational person, so after the initial outburst, she might start to analyze what went wrong in their relationship.
She would probably be furious at first. Harry is known for her strong will, and being forced into a marriage, especially with Draco, would go against everything she believes in. She might try to fight it directly, using her magic skills to break free from whatever is forcing this marriage.
Another possibility is that Lucius could be initially confused. He might not understand what he's seeing at first. After all, Harry and Draco are supposed to be enemies in the general wizarding world view. He could stand there for a moment, trying to process what's going on before taking any action.
Sirius may also be angry at first. Given his protective nature towards Harry, if he misinterprets the situation as Draco causing trouble for Harry, he would likely step in assertively. But if it's a situation where Harry and Draco have a more positive or friendly interaction in the fanfiction, Sirius would have to re - evaluate his initial reaction.