Hugo had been sitting with Wren when everything went down with Rose and his mother, and had been as shcoked as everyone at the slap. What shocked him more was Rose's outburst, and he kissed Wren quickly and followed after his mother. HE knew his dad could talk to Rose, but his Mum looked like she needed a hug.
He knew he'd find her in his office, and he knocked gently. "Can I come in?" he asked, only a little hesitant because what if she was crying or something. He didn't think he could handle that. He bit his lip, and entered the office fully, not quite sure what to expect.
He also wasn't sure what to say, so he just crossed to her and wrapped his arms around her, hugging her tight, because he might be nearly grown, she was still his mum.