I have no idea...

My two students are in the elementary school. Although they are different individuals, they're just children. They always think after class they can play computer games. Every time when I said they must do homework at home, they just showed me "I don't wanna do homework." I have no idea to treat them as my friend or my students. Which one is available, a friend or a student? Actually, I'm not a strict teacher because I think children want to learn something new is very difficult. Therefore, they can sit by you and listen to you even not carefully but at least I ask them questions which they can answer me. This is the common situation but they aren't. Perhaps I must train my paitience higher and higher. Otherwise, I will be mad by these two little fairies.