time.
Latter: Latter is an antonym of former and it denotes position
Example: Ritika and Gitika are sisters / but the later / is elder to the former. / No error
Explanation: In the above sentence, there is an error in the second part of the sentence because ‘later’ is comparative degree of ‘late’; ‘latter’ is the opposite of ‘former’. So, ‘later’ should be replaced by ‘latter’.
Therefore the correct sentence would be:
Ritika and Gitika are sisters but the latter is elder to the former.