A novel where the heroine is adopted by the hero's family

The female lead was an orphan, adopted by the male lead's family as a younger sister. The male lead was the eldest at home. The male lead originally thought that the female lead was only 12 years old, but in fact, the female lead was 18 when she was three years old.
It was one of a series of novels. The male protagonist had a cold personality. The novels were about the love history of several brothers.

Answer 1

In many novels, the female protagonist would be adopted by the male protagonist's family because it could create more story lines and character development. Here are some possible scenarios where the heroine is adopted by the hero's family:

The female lead was adopted by the male lead's parents and started a new life. In the male protagonist's house, the female protagonist gradually grew up and made all kinds of friends. She experienced many different adventures and challenges. During this process, the female protagonist gradually discovered that she and the male protagonist had a special relationship, but both sides were unable to confess.

The female lead was originally an orphan who was adopted by the male lead's parents. In the male protagonist's house, the female protagonist gradually got to know the male protagonist and found that they had similar personalities and experiences. With the help of the male protagonist, the female protagonist gradually grew up and found her home and relatives.

3. The female lead was originally a rich girl but was abandoned in the male lead's house for some reason. In the male protagonist's house, the female protagonist experienced many difficult lives, but the male protagonist always cared for and took care of her, allowing her to gradually get out of the predicament. With the help of the male protagonist, the female protagonist gradually grew up and found her home and relatives.

The female protagonist was originally a lowly servant who was adopted by the male protagonist's parents. In the male protagonist's house, the female protagonist gradually grew into an independent and strong woman. With the help of the male protagonist, the female protagonist found her home and relatives and successfully got rid of the shadow of the past.

These were just some possible scenarios. In fact, there were many other scenarios where the female protagonist was adopted by the male protagonist's family, depending on the author's imagination and creativity.