The survey Parents and Children in the Netherlands (OKiN) was based on a stratified random sample of persons aged 25-45 from the Dutch population registers. Persons who grew up in nonintact families were systematically oversampled via the registers. Respondents were interviewed using Computer-Assisted Web Interviewing and those who did not respond were interviewed at home. In total, 6,485 persons participated (response rate of 62%). The parents of the respondents and the current new partners of these parents (if present) were found in the registers and approached for a Computer-Assisted Web Interview and a paper questionnaire follow-up in case of non-response. In total, 9,325 parents participated (response rate of 38%).