Moreover, since it's Hua Jin who promised this, even if his son didn't speak, Qin Dagen was prepared to let the little girl and her family in, out of trust for Hua Jin.
Hua Jin may be young, but Qin Dagen understands from her actions and from what his son said that she's a young lady with good judgment, kind-hearted but not a pushover. Since she dared to let this family come, she naturally approves of them.
Furthermore, the little girl has accurately mentioned Hua Jin's name. They couldn't possibly turn them away now, so he just hoped the family would be easy to get along with; otherwise, it would just bring trouble to themselves.
Seeing the temperature rising, it wasn't the right time to delay. Qin Dagen took the lead and began to walk, and Qin Shu followed suit.
The little girl hesitated for a moment and quickly followed, but there was a hint of worry in her eyes, fearing that when they met her family as she'd described, they would be children and back out.