"Jace...?" Clary said tentatively, slowly approaching him. She placed one hand lightly on his arm. "So..." she started, biting her lower lip and shifting her gaze to the floor. She could see the traces of Luke's blood. Jace turned his head to look into Clary's eyes.
"Clary...he's...it's..." Jace struggled to get the words out. "We..." he falterd, looking away again.
"I know," Clary said gently. "It's okay Jace," she said, pulling him into a tight embrace. "It's going to be okay." She could feel Jace's body trembling in her arms, though she could tell he was fighting to control it.
"But Clary..." he whispered. "How is any of this alright?" There was a hint of anger in his voice, but Clary thought she saw the glimmer of a tear slide down his cheek. The was the first time she had ever seen Jace show any signs of vulnerability. "Everything I thought I knew about my childhood, my family..." he trailed off.
"Jace, listen," Clary said, a little forcefully. "You have family. The Lightwoods. So they're not related to you. They love you, and that's what family is supposed to be, right? You have a mother. A mother who loves and misses you." Clary took a step back. "And you have me." She looked Jace directly in the eye. "I've always wanted a sibling," she said, as a huge smile spread across her face.
Jace blinked back a tear, and stared at Clary's face and outstretched arms for a second before pulling her into a hug. "I've always wanted a sister too," he replied. "Don't tell Isabelle I said that," he added, laughing to himself.