When a group only has two members, we sometimes use a comparativeinstead of a superlative. I like Lily and Mia, but I think Mia’s the nicer/nicest of the two. I'll give you the bigger/biggest steak: I'm not very hungry. Some people feel that a superlative is incorrect in this case.
Also, in 'A Comprehensive Grammar of the English Language',
'The superlative is often used for a comparison between two persons, items, etc , though this is avoided in careful usage where the comparative [3a] is preferred : He is the youngest (of the two brothers).  He is the younger (of the two brothers). [3a]
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