Using administrative data on all adult children living in The Netherlands age 30-40 and their parents (N = 1,999,700), we investigated the extent to which situations and events associated with the support needs and privacy needs of either generation determine intergenerational coresidence and the transition to coresidence. Logistic and multinomial logistic regression analyses showed that both generations' support needs increased the likelihood of coresidence and of a move of the generation in need into the other's home. Turning to privacy needs, we found that coresidence and the transition to coresidence was less likely when a partner or stepparent was present and more likely when the adult child was a never-married single parent.