This study aimed to develop and validate two Portuguese versions of the Work–Family Conflict Scale (WFCS) and the Work–Family Enrichment Scale (WFES), testing for its factor structure validity, reliability, and measurement invariance across gender. Both WFCS and WFES were translated according to the guidelines of the International Test Commission and tested with two Portuguese samples of working parents, involved in dual-earner relationships. The validation of these two scales was established by confirming the dimensionality of their structures (first- and second-order confirmatory factor analyses) and demonstrating the good discriminant validity, convergent validity, and internal consistency of its subscales. Finally, for both WFCS and WFES, a two-group measurement procedure allowed to demonstrate their measurement invariance across gender.