This article describes the cross-cultural adaption and psychometric testing of the Family Nursing Practice Scale (FNPS) German version. The FNPS aims to examine self-reported family nursing practice skills and reciprocity in the nurse-family relationship. Using a cross-sectional design, 583 acute and critical care nurses were invited to complete the FNPS German version. Exploratory factor analysis was used to assess the structural validity. Internal consistency was determined using Cronbach's alpha. A total of 317 nurses returned a completed online questionnaire. Principal axis factor analysis suggests a one-factor solution in which all 10 items are retained, accounting for 36% of the variance. Cronbach's alpha was .84. In contrast to the original version, our findings indicate the unidimensionality of the construct. The FNPS German version appears to be a valid and reliable scale to assess nurses' perception of their family nursing practice proficiency. Further testing is needed to confirm the unidimensionality and to establish test-retest reliability.