It's good to exchange marriages. My sister eats coarse food while I wear gold and silver.

"Meng Yanshan, I'm not saying anything bad about you, but what have you taught your eldest daughter? What do you mean she can only be a concubine? We are all born of the same mother, so why should we distinguish between the superior and the inferior?" Marquis Wanning rolled his eyes at Marquis Yong'an, "You should teach her well, or she won't cause any trouble in the future and bring trouble to your whole family."

"Zhu Yan, please stop talking. Zhu Xin is your biological sister. She has taken care of you without complaint over the years. Even if she has no credit, she has worked hard." Marquis Yong'an felt a little embarrassed when he was scolded by Marquis Wanning in front of his daughter.

"Father!"

Meng Zhuyan was so angry that she stamped her feet, but she could do nothing but glare at Meng Zhuxin fiercely.

Upon seeing this, Lu Bing immediately pulled Meng Zhuxin behind him to protect her, puffed out his chest and glared back.

Meng Zhuxin was touched, but she still felt that her elder sister's attitude was a little strange.

Especially the sentence by Wan Ninghou: "They are both daughters, why is one in poor health and the other in good health? You two are also in good health at your age, so what is wrong?"

Is it...

Meng Zhuxin had her doubts, but without sufficient evidence, she did not dare to act rashly.

Let’s wait until we get back to Wanning Marquis’ Mansion to discuss it.

"Okay, today I'm bringing Bing'er to propose marriage, Marquis Yong'an, we've already agreed on it, don't go back on your word after one day? You know my temper, you definitely don't want this matter at home to be known by all the civil and military officials in the court, right?" Marquis Wanning chuckled, he knew how to threaten Marquis Yong'an.

"I call you my in-laws, is that true?" The Marquis of Yong'an had a fierce face, but when he looked at Meng Zhuxin, he suddenly became friendly, "Zhuxin, during the time you live in the Marquis of Wanning's mansion, you should be filial to your future parents-in-law, get along well with Lu Bing, and don't act like a spoiled brat."

"Zhu Xin is sensible and obedient. She won't throw tantrums like your eldest daughter." Marquis Wan Ning snorted. Anyway, the purpose of his visit today had been achieved, so he wanted to go back home with his son and daughter-in-law.

Wait until Wan Ning Hou and his group disappeared.

When Yong'an Hou looked at his eldest daughter, his expression suddenly turned cold: "Look at what you have done."

"Father, what did I do wrong? It's obvious that you are biased towards Meng Zhuxin!" It was the first time that Meng Zhuyan heard her father speak so harshly. Tears welled up in her eyes. "You and mother clearly promised me that."

"You bastard, your mother is still lying on the ground, and you don't even give her a hand." Marquis Yong'an was too lazy to say anything to her. When he bent down to pull the still unconscious lady up from the ground, he felt a dull pain in his chest.

After he has settled his wife, he will go to the Duke of Rong's Mansion to settle the score with Zhang Kun.

Wanning Marquis Mansion.

When Meng Zhuxin got off the carriage, her foot slipped. Fortunately, Lu Bing, who got off first, found her in time and hugged her: "Zhuxin, what's wrong with you?"

"I am fine."

Meng Zhuxin came back to her senses and shook her head. Seeing Wan Ning Hou making faces at the side, she quickly pushed Lu Bing away and said, "I'll go find Sister Bu Wei first."

"Oh."

Lu Bing nodded and watched Meng Zhuxin enter the door with a silly look on his face.

"Stinky boy."

Unable to bear it any longer, Wan Ning Hou punched his son in the chest and said, "You are such a fool. Don't tell others that you are my son when you go out."

"Father, how did I displease you?" Lu Bing frowned, rubbing his chest that was hurt by his father's beating. "Meng Zhuyan is really a piece of shit. Father, do you think she will bear a grudge for what happened today and take revenge on Zhuxin?"

Wan Ning Hou snorted coldly: "If she dares to retaliate, I will send her to hell. Anyway, for Yong An Hou, this eldest daughter is probably useless."

"what?"

Lu Bing was a little confused after hearing this.

Also a son.

One is smart and capable, the other is stupid and dull.

Wan Ning Hou sighed heavily: "You should finish the business of the medicine shop first. Don't worry about other things. I'm here for you."

Lu Bing immediately stepped back and bowed with both hands: "Thank you, father."

"Don't try that on me." Wan Ning Hou glared at his son, and the next second his eyes showed a bit of sadness, "I don't know when Sui'er will get better. Bing'er, you have to fight for your dignity and show them that none of my children are bad."

"I know that if I keep a high profile, those who have bad intentions towards my brother will be punished by me. In this way, my brother can breathe a sigh of relief." Lu Bing patted his chest and said, "Father, I will take care of this matter."

Marquis Wanning looked at his second son with a serious face and thought that he had not really cared about him that much since he was a child.

In the blink of an eye, he is going to get married.

"Bing'er, do you feel that I have neglected you too much over the years?"

"what?"

Lu Bing looked at his father with a vigilant look on his face: "Father, Father, I haven't done anything to make you angry recently, right?"

The corners of Wanning Hou's mouth twitched.

The sadness that had just been brewing was completely wiped out by my son's words.

"Hurry up and go to the pharmacy. Go, go, go, don't get in my way."

Lu Bing breathed a sigh of relief.

This is what a normal father is like.

"Okay, Father!"

Yuan Buwei thought that her father-in-law and the other two would not be back until the evening, and she never expected that they would come back so soon.

But Meng Zhuxin looked worried.

"What's wrong, Zhuxin? Is the problem not solved? Have you encountered any difficulties?"

"No." Meng Zhuxin shook her head and looked up at Yuan Buwei, "Sister Buwei, do you have any means to verify the blood relationship?"

"Blood relationship?" Yuan Buwei was a little confused. "What are you doubting?"

"Just today, Marquis Wan Ning said that they are both daughters, and their parents are in good health, but why is my eldest sister not in good health? I didn't take it seriously at first, but when I came back, I carefully recalled my eldest sister's words and deeds in the past. She seems to be really different from us. Even her taste in food is different. I thought she developed this habit because she was sick for too long, but it seems like it's innate."

Yuan Buwei raised her eyebrows and asked in a low voice, "Do you suspect that your sister is not your parents' biological child?"

Meng Zhuxin hesitated for a moment and nodded: "Of course I don't suspect that my mother betrayed my father, nor that my father hid it from my mother, but I think she..."

"She was replaced by someone else."

Seeing Meng Zhuxin's eyes light up, Yuan Buwei took a sip of tea and said, "You have doubts now. If you want to investigate, you should start with the old servants in Yong'an Marquis's mansion. It would be best if you could find the midwife who delivered your mother. The midwife is the first person to come into contact with the baby, and is also the most likely person to switch the baby. In addition, the wet nurse, maid, and nanny who took care of your sister at the time could have switched the baby. If you want to find a reason from them, then the other party must hate your parents, or have encountered some difficulties themselves."

Meng Zhuxin listened thoughtfully, and after a while, a person came to her mind.