True and False Daughter

There Is an Adopted Daughter in the Family for No Reason, and Then the Adopted Daughter Becomes Ill, Similar to the Story

I want to read a book similar to "I Drive the White Lotus Heroine Crazy (Xie Sisi)". That is, do you have one of those particularly boring cool novels where an adopted daughter is found in the family for no apparent reason, and then the adopted daughter becomes ill and must be given up to her? The heroine must have an older brother. Just started