The look in his eyes is the one Bella Stuart fears most. Generally, when her elder brother stops speaking, it implies: If she doesn't have the sense to leave, the elder brother might lose his temper!
"All right... we're leaving. Goodbye, Brother. Goodbye, Little Nephew. Goodbye, Mummy of my Little Nephew." In the blink of an eye, Bella Stuart, acting like another person entirely, formally bowed to Baron Stuart and Emily Walker and spoke in a leisurely manner.
After speaking, she turned around and followed Vivian Ferguson out the door.
Bella Stuart didn't understand, but Vivian Ferguson saw everything.
Perhaps the reason her son didn't want his daughter to stay there was because he was afraid her carefree personality would harm Emily Walker and the child in her belly, right?
However, she, Bella Stuart's mother, also wasn't confident about Bella Stuart staying there. With Bella's uncaring nature, if she hurt mother and son Emily and Walker, it would be terrible.