妈妈和儿子的dna不同吗

After Ning Cheng walked out of Fangshi quickly, he realized that it wasn't that no one came out of Fangshi, but that too many people came out. The vast majority of people gathered outside the cave where Nong Xiruo practiced. The restriction on Nong Xiruo's cave had been broken long ago. There were still several strong men guarding Nong Xiruo's cave....