Ошибка при выходных данных словаря

DEFAULT = {
​ ​ 'name': 'John',
​ ​ 'surname': 'Doe',
​ ​ 'children': []
}
 
people = []
num = input('num of people: ')
for i in range(int(num)):
​ ​ name = input('name: ') or DEFAULT.get('name')
​ ​ surname = input('surname: ') or DEFAULT.get('surname')
​ ​ children = DEFAULT.get('children')
​ ​ child = None
​ ​ while child != '':
​ ​ ​ ​ child = input('child: ')
​ ​ ​ ​ if child:
​ ​ ​ ​ ​ ​ children.append(child)
​ ​ people.append({'name': name, 'surname': surname, 'children': children})
 
for i, each in enumerate(people, 1):
​ ​ print(f'{i}: {each}')

import copy
 
DEFAULT = {
    'name': 'John',
    'surname': 'Doe',
    'children': []
}
 
people = []
num = input('num of people: ')
for i in range(int(num)):
    name = input('name: ') or DEFAULT.get('name')
    surname = input('surname: ') or DEFAULT.get('surname')
    children = copy.deepcopy(DEFAULT.get('children'))
    child = None
    while child != '':
        child = input('child: ')
        if child:
            children.append(child)
    people.append({'name': name, 'surname': surname, 'children': children})
 
for i, each in enumerate(people, 1):
    print(f'{i}: {each}')

import copy  
X = copy.deepcopy(Y)              # Создание полной копии: копируются все вложенные части