Change ChromeOptions in an existing webdriver

Scenario: There is a requirement of downloading files from web hierarchy to local drive under same hierarchy.

Example Web Hierarchy:

Parent 1:  
  Child 1:  
    *File 1  
  Child 2:  
    *File 2  

When downloading File 1, it should store in path 1 - "C:\....\Downloads\Parent 1\Child 1\"

When downloading File 2, it should store in path 2 - "C:\....\Downloads\Parent 1\Child 2\"

Problem:

When I keep "C:....\Downloads\Parent 1\Child 1\" download path in chrome webdriver while initializing webdriver first time in setUp() & download "File 1", it downloads in expected folder. But when I set next "C:....\Downloads\Parent 1\Child 2\" download path in chrome webdriver for downloading File 2 in it, it opens another chrome browser because I am using another webdriver for setting path 2.

Required Solution:

I want to use existing webdriver to set different chrome download paths or any other workaround you can think of.

Current Code:

def setUp(self):  
browser = webdriver.Chrome(chromedriver_path, option_with_path_1_set)

def test_downloadFiles(self):  
\*code to download first file\*  
driver = webdriver.Chrome(chromedriver_path, option_with_path_2_set)  
\*code to download second file\*  

def tearDown(self):  
browser.quit()

Please let me know if you require any additional information.

Thanks in advance!