Some time after, Patrick was set to marry a woman whom his parents had picked out for him. Instead, he left Idris and ran off to the Beijing Institute where he married Jia, causing something of a scandal in the Shadowhunter world. Luke once stated that Patrick was never one to follow the rules.
For the signing of the Tenth Accords, Patrick and Jia allowed his nephew Sebastian Verlac and the Lightwoods, who had remained good friends of the family over the years, to stay in their home in Idris. He also attended the Clave meeting where the impending battle against Valentine's army was discussed. He witnessed Valentine's Projection into the Accords Hall and his murder of Inquisitor Aldertree.
Patrick and Jia were shocked when Robert and Maryse confronted them about their nephew Sebastian killing their youngest son, Max. The pair of parents had a brief falling out, though they eventually found out that it had been Valentine's son posing as their nephew who killed Max.
When Clary suggested to the Clave the use of her Alliance rune, Patrick lent her his stele as hers had gotten lost. Patrick was among those who agreed to have the rune placed on him, and he partnered with a warlock during the battle against Valentine's army of demons, which they won. Patrick attended Valentine's funeral and was the one who burned his pyre, and he and his family later attended the victory party at Angel Square.
Some time after, Aline, inspired by Alec Lightwood and Magnus Bane's kiss before the war, came out to Patrick and Jia, admitting to them and herself that she was a lesbian. Aline met and began dating Helen Blackthorn, despite the Clave's disapproval and Patrick's initial reservations, as he was dismayed about the end of his branch of the Penhallows.
Patrick and his wife once again welcomed guests into their home—this time, the Consul's residence—when the family of Aline's girlfriend needed a place to stay after Sebastian attacked the Los Angeles Institute.
When the Downworld representatives, and Jocelyn Fray, went missing after a meeting, Patrick and a team of guards searched the city for any sign of them. He was also among the groups of Shadowhunters who discussed whether to give into Sebastian's demands or not. He and Jia fought hard against the very idea.
When they learned that Clary, Jace, Simon, Isabelle, and Alec had escaped Alicante, Jia was frantic while Patrick was calmed by Alec's presence, believing that Alec would be the adult and would look after the rest. Patrick pointed out that they were likely where Sebastian was, as they were all untraceable.