A third twin

WuXin, the weakest, who shouldn't have survived the first days. WuNing, the strongest, who would have had a chance outside Yung manor. They know close to nothing about the mysterious circumstances of the third child.
Truth is, Lady Qiu knew she wouldn't have survived, regardless she went to bless her children in three different temples, hoping the best for them. Light, Love and Life.
The pregnancy of three was already difficult, plus she was weak from the very beginning, not suitable to have children, and with no support from her husband. She knew and she was sorry, deeply sorry for her children, she had to find a way to assure they'd live so she asked for help to one of the few friends she had in life. Lady Nian, wife of Admiral Nian. She was well aware she was about to have twins, she could feel all of them, and she was also aware of the fate they could have had as such.
Before giving birth, she prepared three packages, one for each, with the names she wanted to give them written on top; Yibo, Yifan and Yiyu. Courtesy names WuXin, WuTang and WuNing. In each package, one set of clothes (hanfu, 6 years old size, white decorated in gold for WuXin, pink with red decorations for WuTang and light blue with white decorations for WuNing), a plush (Tenshu, strawberry finch and snow leopard), and a letter, same for everyone.

| My child. I'm sorry I cannot be there to take care of you. I really wanted to be, hold you tight, comfort your cry, see you grow...it feels impossible.
My love for you is endless but even if my feeling is strong, my body is too weak. I have to leave early but I'll be looking after you from the Halls. You can count on your oldest brother and lady Nian for anything, I leave you in good hands. I wish you live a long and happy life - your mom |

She studied a plan to let the children have them but it was ruined by Liao, who found out. Outside, she set a powerful curse to make him unable to destroy them in any way - the late General hid them somewhere not to risk the news he had three twins could spread.

When they were born, she didn't want anyone inside except the physician. She gave birth to WuNing first, then WuTang and last WuXin.
She paid the physician to give two of them to Lady Nian, telling him where he'd find her waiting. She died not long after, her bleeding wouldn't stop. The physician saw them three and got a different idea, since one was already so weak and close to die. He took only one, WuTang, to Lady Nian.