Patrick and Finn are stepbrothers. Finn Hudson is Patrick's eldest stepbrother and even though they are not related by blood, Patrick has always considered him to be his real brother. Patrick always went to Finn to talk about stuff that he was uncertain or scared about and Finn always did his best to offer him comfort, advice and help. Finn has never laughed at him once in his entire life and he makes Patrick feel at ease. Just knowing that Finn has his back and will always be there for him gives him the strength to go on in life.
Finn always played with Patrick and his brothers and he always shared his toys with them. Not once has he ever raised his voice at him. As soon as Patrick, Brody or Liam make a distressed sound, Finn immediately runs up to them to see what's wrong and then he immediately turns into an overprotective brother. Sometimes Patrick faked to be hurt just so he could have Finn's attention on him; he never knew that Finn knew that it was fake, but it was a good reason for Finn to take care of and spend time with him.
Patrick has slept in Finn's bed with Brody and Liam almost every day of their entire childhood – until the day arrived on which Finn had to leave for Hogwarts. His departure fell heavy on him and his other brothers but they knew they at least had each other. Patrick, Brody and Liam sent Finn letters every week and always told him what happened back at home and how much they miss him and can't wait to see him again during the holidays.