Some of our acquaintances are having apprehensions regarding marrying with near relatives. I am looking for some authentic medical document on this subject to remove the doubts.
Teeuw, M. E., Loukili, G., Bartels, E. A., ten Kate, L. P., Cornel, M. C., & Henneman, L. (2014). Consanguineous marriage and reproductive risk: attitudes and understanding of ethnic groups practising consanguinity in Western society. European Journal of Human Genetics, 22(4), 452–457. http://doi.org/10.1038/ejhg.2013.167
The National Institutes of Health (NIH) has some material. For example, the article on by Consanguineous marriages
Preconception consultation in primary health care settings by Hanan Hamamy at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3419292/
also Consanguineous Marriage and Intellectual and Developmental Disabilities among Arab Bedouins Children of the Negev Region in Southern Israel: A Pilot Study
Hassan Abu Saad,1,2,3 Salman Elbedour,4 Eyad Hallaq,5 Joav errick,6,7,8,9,* and Ariel Tenenbaum6, at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3904202/
Use the search terms NIH and consanguinous marriage and you'll find more.