First Mrs. Sterling isn't foolish. She took the wheelchair James Sterling was pushing, moved forward, and stopped in front of Mrs. Sterling, smilingly saying to everyone, "I just let everyone have a laugh."
After saying that, she turned her head to glance at Mrs. Sterling, laughing coldly, "Just as you said, I have such a wonderful daughter, as I hoped."
This was an indirect admission of Serena Sullivan's identity.
The inconsistent attitude of First Mrs. Sterling made everyone bewildered. Regardless, the illegitimate daughter in the wheelchair was accepted by The Sterling Family and would replace Felicity Sterling to become the family's eldest daughter.
After James Sterling's family left, the old master also claimed he wasn't feeling well, leaving the subsequent party to Mr. Sterling to host.
The guests thought Mr. Sterling was busy with work and would let Mrs. Sterling help oversee things.
He didn't. He socialized with the guests until the end.
