Chances for RA if a family member has RA? Dr. B Masri reviews familial studies: 👉person w/1st degree relative w/ RA has 2-4 X risk 👉Multigen study standard incidence ratios: 3.02 child, 4.64 siblings, 9.31 in multiplex family, 6.48 twins, 1.17 in spouses #ACR21 @rheumnow 1/