Twin

Results when two people share a big bro in the same term. The two lil bros of that big bro are considered twins. Some twin pairs include Eddie Chan and Jason Greene, Monlia Wu and Stillwell Yang,and Joseph Milligan and Julie Chiu.

If that big bro happens to take more than two lil bros in a term, those lil bros may be referred to as "triplets," "quadruplets," or so on, as it becomes appropriate.