error expected declaration in family class - swift

Question

i was making a family class when it popped up an error it was "expected declaration" i'm not sure what it means and how to debug it
//
// ViewController.swift
// familyClassSecond
//
// Created by Dordor Zheng on 11/13/16.
// Copyright © 2016 Dordor Zheng. All rights reserved.
//
import UIKit
class Person {
var name : String!
var age : String!
var idNum : Int!
init(name:String, age:String, idNum:Int){
self.name = name
self.age = age
self.idNum = idNum
}
func sayPerson() -> String{
let S = "Hi i'm \(name) i am \(age) years old and my id is \(idNum)"
print(S)
return S
}
}
class female : Person {
var sex : String = "female"
override func sayPerson() -> String {
let S = "Hi i'm \(name) and i am \(age) years old"
print(S)
return S
}
}
class male : Person {
var sex : String = "male"
override func sayPerson() -> String {
let S = "Hi i'm \(name) and i am \(age) years old"
print(S)
return S
}
}
class daughter: female {
var mother : female!
var father : male!
var sibbling : Array<Person>! = []
init(me:female,father:male,mother:female,brother:male){
super.init(name: me.name, age: me.age, idNum: me.idNum)
self.father = father
self.mother = mother
}
override func sayPerson() -> String {
let S = "I'm \(name), i am \(age) years old my father is \(father.name) and my mother is \(mother.name)"
print(S)
return S
}
func appendSibbling(brother:Person){
sibbling.append(brother)
}
}
class brother: male {
var mother : female!
var father : male!
var sibbling : Array<Person>! = []
init(me:male,father:male,mother:female,daughter:female){
super.init(name: me.name, age: me.age, idNum: me.idNum)
self.father = father
self.mother = mother
}
override func sayPerson() -> String {
let S = "I'm \(name), i am \(age) years old my father is \(father.name) and my mother is \(mother.name)"
print(S)
return S
}
}
class father: male {
var wife : female!
var children : Array<Person>! = []
init(me:male, wife:female,child:Person,brother:male){
super.init(name: me.name, age: me.age, idNum: me.idNum)
self.wife = wife
self.children.append(child)
self.children.append(brother)
}
if(children.count == 1 || children.count == 0){
var choose = "child"
}else{
choose = "children"
}
override func sayPerson() -> String {
let S = "I'm \(name), i am \(age) years old i have \(children.count) children and my wife is \(wife.name)"
print(S)
return S
}
}
class mother: female {
var husband : male!
var children : Array<Person>! = []
init(me:female, husband:male,child:Person,brother:male){
super.init(name: me.name, age: me.age, idNum: me.idNum)
self.husband = husband
self.children.append(child)
self.children.append(brother)
}
override func sayPerson() -> String {
let S = "I'm \(name), i am \(age) years old i have \(children.count) children and my husband is \(husband.name)"
print(S)
return S
}
}
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let one = female(name: "Dordor", age: "8", idNum: 388313)
let two = male(name: "Tiger", age: "24", idNum: 773424)
let three = male(name: "Chiwen", age: "48", idNum: 143303)
let four = female(name: "Hongwen", age: "47", idNum: 243332)
let child = daughter(me: one, father: three, mother: four, brother: two)
let mom = mother(me: four, husband: three, child: one,brother:two)
let dad = father(me: three, wife: four, child: one,brother: two)
let bigB = brother(me: two, father: three, mother: four, daughter: one)
child.sayPerson()
mom.sayPerson()
dad.sayPerson()
bigB.sayPerson()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
do you have any ideas and the error is on the if
you can copy paste into your code cause i'm using swift 9.2(it's not beta)

Answer 1

You need to make choose a computed property:
var choose : String {
if children.count == 1 || children.count == 0 {
return "child"
} else {
return "children"
}
}

Answer 2

You can pick between two options that you have
Convert choose to a lazy variable:
lazy var choose: String = {
if(self.children.count == 1 || self.children.count == 0){
return "child"
} else {
return "children"
}
}()
Make choose a function:
func choose() -> String {
if(self.children.count == 1 || self.children.count == 0){
return "child"
}else{
return "children"
}
}