The paper reports on a study of communication skills in twin infants, a deaf male and a hearing female, who have hearing impaired parents and an older deaf sibling. Videotapes of interaction in the home were transcribed and analyzed according to communication mode and pragmatic function. Findings suggested that both twins were somewhat delayed in certain areas of language development, even compared to deaf norms. The female exhibited a greater amount of communication than the male, perhaps indicating a more generalized perception of differences between the twin's operational styles. The beginnings of code switching behaviors were evidenced, especially in the female infant's apparent discrimination between interactors on the basis of communication modality. Pragmatic analysis revealed marked similarity in performance and congruence with what is known about language development of deaf and hearing children. (CL)