His mother calls both him and Missy "dumb as soup" in "The Luminous Fish Effect" (S1E04), though this may be an exaggeration, as this description did not particularly fit Missy when she appeared. Sheldon mentions him in "The Jiminy Conjecture" (S3E02), saying "I grew up with an older brother and a very contentious twin sister." Sheldon's family pedigree, depicted briefly in "The Cruciferous Vegetable Amplification" (S4E02), shows a brother as well as a twin sister. In "The Cooper Extraction" (S7E11) Sheldon mentions "my brother's kidney stone", presumably meaning his.