The goal of this paper is to study attitude stability in schizophrenics' relatives, as reflected in the expressed emotion (EE) construct. For this purpose, the EE of 32 families of schizophrenic patients was assessed by means of the Camberwell Family Interview (CFI, Brown, Birley, & Wing, 1972; Vaughn & Leff, 1976b), both initially and at a 9-month follow-up. The results obtained indicate that EE is stable in fathers, whereas in mothers, high EE seems to be influenced by stressful situations, because, when assessed in crisis, EE was not stable, but in-between crises, it was. These results are discussed, as well as their relevance in family interventions aimed at reducing EE, where clinicians should take into account that mothers' EE may drop because of its instability, and not because of the intervention. On the other hand, clinicians should focus especially on fathers, because their high EE is constant, which is stressful to the patient during the follow-up.