abstract class PersonList {
}

class EmptyPL extends PersonList {
}

class LargerPL extends PersonList {
 Person first;
 PersonList rest;

 LargerPL( Person first, PersonList rest ) {
   this.first = first;
   this.rest = rest;
 }
}

class Person {
  String name;
  PersonList kids;

  Person( String name, PersonList kids ) {
   this.name = name;
   this.kids = kids;
  }
}