They didn't take action against Roland and his family because they feared Eric.

"Thank you, Mr. Johnson," Roland expressed his gratitude.

He understood what it meant for his daughter to live in the Pettersons' manor, and Eric had saved her from that fate.

Eric replied, "You helped me, so I'll help you in return."

Most importantly, he despised the Pettersons.

On the surface, the Pettersons appeared to be inviting Valerie to live with them, but in reality, it was no different from kidnapping.