Patrick met Jackson on the same day he met Theo in May 1993. The two exchanged good luck wishes before a Quidditch match between Hufflepuff and Slytherin. Patrick never really thought much of him other than the fact that he was nice and friendly, unlike most Slytherins, until he found out that Jackson was dating Brody in secret.
Without telling Brody, Patrick went behind his back to meet up with Jackson to inform him that if he ever did anything to break Brody's heart, that Patrick would come back and break something of his. Jackson, who normally never backs down when he's being threatened, felt impressed by his boyfriend's brother and promised that he'd take good care of Brody and that he'd never do anything to harm him.
When someone of his family is being threatened or bullied, Patrick usually goes to Jackson and his boyfriend Theo to ask them for help in getting revenge. The two Slytherins gladly offer their services; Jackson becomes a very good friend of Patrick because of the traits they share.