SandyTree's manga / #duke of the north(7)

https://m.qimiaomh.com/manhua/5024.html Current 39 So the dukes family has an issue with conceiving. In order to have a son both parent must be related. In order to have a daughter the women must have been purified with mug worth before her menstruation becomes regular or whatever then take the herbs/ cure for a year. She also would have to been a virgin and only have been with a duke. The dukes brother didn’t know that he fell for his sister. She was abandoned outside after their father found out she had poor health. He also didn’t know she was pregnant. I think the doctor has something to do with them meeting I’m not sure. The duke thinks the only way to have a kid outside of the incest is this weird thing like “drinking blood of Lucia” or something the doctor told him as a lie in order to deceive him. So any children of Lucias would be female and the only way for the nephew to have a son and pass on the name would be to marry Lucias child. Which is what the doctor later wants( hence the lie to the duke about the blood) He plans to have the son/ nephew marry the daughter in order to pass down the bloodline.

https://newtoki340.com/webtoon/37901545?stx=남편은+한+명으로+족하다&title=남편은-한-명으로-족하다 10 Propose to Roger 11 Margot 15 Roger's mother 16 If you want to, you can kiss me whenever 17 Prince visits 18 Roger is knocked out by the drug 19 Gaetani tries to put off the prince 20 Roger's mother loses her mind 21 Assassins burn down the Darkret mansion 22 Madam Darkret's funeral 23 Crochetta takes the blame -> Breakup 24 Crochetta accepts the prince's proposal 25 Masquerade outfit 26 Roger interrupts the dance 27 Gaetani runs into Duke Battenberg 28 Uncontrollable tears 29 Sleep with me rn 30 Roger spots them, Crochetta despairs that she's still not logged out 31 Margot kidnaps Crochetta