The sentence revision is: Nikita would like to know which car is theirs.
The possessive pronoun here is <em>theirs.</em>
<em>Theirs</em> replaces<em> belongs to Yosef and Taiga.</em>
Possessive pronouns help to show possession or ownership in a sentence. There are two types of possessive pronouns; 
 - the strong ( absolute ) possessive pronouns: mine, your, his, her, its, ours, yours and <em>theirs</em>. Their refer back to a noun already used replacing it to avoid repetition. 
- the weak possessive pronouns : my, your, his, her, its, our, your, their. They function as determiners in front of the noun to to describe who something belongs to. 
 
        
                    
             
        
        
        
Which book or movie are you talking about
        
                    
             
        
        
        
For the first red, you don't need an article before "relationship".
When you're saying "type of [word]", do not put any article before that word.
Example: "a type of device"
Not too sure about the "your back" parts. It could be your teacher does not like repition.
Also not too sure about "did". He probably wanted you to use the word "felt" instead of "did feel"
The first word of the last paragraph should be "in" not "at".
The red commas definitely do not need to be there.
Don't know why he marked "time to" and "to" red.
 
        
             
        
        
        
Answer:
<h3>The 'cousin' is an important and yet unnamed character in the novel The Vendor of Sweet, written by Indian author R.K. Narayan . He lives in Maguldi along with Jagan and his son Mali . He plays well with both Jagan's and traditionalist view and Mali's more modern ideas .</h3>
 
        
             
        
        
        
That’s cool, hook them up to why don’t we (they’re a boy band)