Patrick had seen Quinn Fabray walk around in Hogwarts but never had a conversation with her nor met her. That all changed when his stepbrother Finn Hudson became a couple with her in 1991. Finn introduced Quinn to Patrick, Liam and Brody as his girlfriend and the three were immediately in love with how friendly Quinn was. It was clear to them that she had taken an instant liking to them as they had with her. Quinn started to care for them and is always willing to help them out whenever they have questions about something or are in trouble. However, due to the fact that Quinn is from Ravenclaw and is a year higher than him, Patrick doesn't interact much with her at school.
Finn always brings Quinn over to their house at the end of another year at Hogwarts where she will stay for a couple of days to hang out with her boyfriend and his family. Quinn always helps Carole in the kitchen and she was immediately accepted by both her and Joshua, who complimented Finn on getting such a nice, sweet and polite young woman as his girlfriend and that she would be a great addition to the family.
Patrick and Quinn always read together when they're all by themselves, it's one of their special activities to do. They love to discuss everything that happens in the books they are reading and they listen to and respect each other's opinion about certain topics and characters.