immediate family member

基本解释

Mohamad Kabir sits in front of his makeshift shelter with his only surviving immediate family member, his son, Wajid.
Mohamad Kabir坐在他的临时住所前，和他在一起的是他的儿子Wajid，也是他唯一幸存的直系家人。
The mentor could not be an immediate family member or live in the youth's home and had to be at least five years older.
这些精神导师可能并不是青年人家庭中的一员，也不需要和青年居住在一起，但是要求必须比青年人至少年长5岁。
An immediate family member (parent, sibling), friend, or someone with whom you're romantically involved may be under stress and require your help.
直系亲属（父母，兄弟姐妹），朋友或爱人在一起，就是你在爱情上，可在压力下，需要你的帮助。

Six years ago, my younger brother Peter, who was my closest friend and the only remaining member of my immediate family, ended his life.
NPR: Living in the Here and Now