This study completed the initial stages in the development of the Johnson In-Law Attitude Scale, which is an instrument designed to measure attitudes toward one's family of in-laws, both before and during the marriage, and relationships with parents. A thorough review of literature relative to in-laws is included. The study revealed that the entire family of in-laws represents multifaceted and complex relationships which are not easily measured by a small number of items. It also pointed out the need for theory development. The paper explores the methodological considerations and implications of studying in-law relations in terms of the endless possibilities an individual has for in-laws. The attitude scale, while statistically reliable and valid, did not appear to be sensitive to individual family differences, composition, and special situations. The paper suggests alternative means of studying in-laws, as well as future implementation of the Johnson In-Law Attitude Scale. The use of the interview method, given adequate time and other resources, was suggested as a more controllable means of understanding and predicting in-law adjustment. (Author)