《宋史·列传·卷四》
没有子女，仁宗时，诏令将允成的儿子宗保出继给昭成太子为孙。
无子，仁宗时，诏以允成子宗保出后昭成太子为孙。
He had no children. During the reign of Emperor Renzong, an edict was issued to let Yunsheng's son Zongbao be adopted by Zhaocheng Crown Prince as his grandson.