17-year-old children know that they are adopted and have been away from home for 20 days. How to persuade them to go home?

Twenty days later, when it was time to start school, I ran away from home again, didn't go to school, stayed with that boy (I didn't know that boy for a long time) and didn't come home, saying: I have a wall in my heart, I can't face us, I love us, and I admit that my family is good to her. The father thought the child was heartless and refused to look for it. He hopes to come back after hitting a wall outside. On the day the child left, he sent a text message to show that he was homesick. He also said he would go to school, said he would go home several times, and then he changed. He also said he couldn't face us. Coupled with the temptation of the boy, the boy is 24 years old and tells the child that he will commit suicide as long as she leaves. Children usually have a good relationship with grandma, and grandma can't persuade them. In the past, children did not run away from home, but they had a general relationship with their parents. The children were adopted by grandma. Grandma lived with us when they were one year old and five months old. Usually grandma doesn't cooperate with her mother to educate her children. The relationship between children and mothers is poor, and so is the relationship between family members. Parents have been in the cold war for more than a year, and the children have not talked to them seriously after knowing their life experience. On the day of leaving, the child once went to his aunt's house. I met this kid once. The child said he was afraid to go home. He can't say why, but he dare not. No one can convince him. Family is good to children in life, and children recognize it, but children have no one to rely on spiritually. Grandma often does some unreasonable things and makes some bad explanations for her mother's education for her children. Her mother's education method is very simple, and she doesn't pay attention to the inner changes of her children. Her father is busy with his work, and his personality is somewhat capricious, and he also has some authority at home. Now I want to know what my children think, how to make them want to go home, and how to eliminate the influence of life experience on them so that they can get along in the future.