As for attacking the woman beside Lu Tianxing, the Tang Family almost never considered this, as anyone who isn't a fool can guess that Lu Tianxing would definitely protect the woman by his side. It's even harder to deal with her than with Lu Tianxing himself, and it may result in losing both money and troops.
Since they can't deal with Lu Tianxing, his woman, or Lu Haoyue, if the Tang Family wants to constrain the Lu Family and prevent them from sending people to deal with Tang Qingyun, the best strategy is to kidnap Dou Fangfang. Kidnapping Dou Fangfang would successfully restrain the Lu Family and even deal a comprehensive blow, unless Lu Haoyue can watch his fiancée get into trouble without doing anything. Otherwise, they must follow the Tang Family's demands and become a pawn in their hands.
Therefore, when they took action, Lu Haoyue secretly arranged Lu Chuan to be by Dou Fangfang's side for protection in case of emergencies.
