Nanny Rong hesitated and said, "Didn't the Marquis say we still need to wait for news from the Magistrate?"
Waiting for the Magistrate's news means that the identities of these two children in the ninth branch are still undecided; they won't be added to the family genealogy. Gu Jingcheng is just helping take care of these children.
It's all merely a temporary measure.
Old Madam Gu frowned, thought for a while, and said, "Well, they've been here with me for quite some days..."
