Young adult internal migration forms a large share of the influx of people into largecities in the developed world. We investigate the role of the residential locations ofsiblings for young adults’ migration to large cities, using the case of Sweden and itsfour largest cities: Stockholm, Gothenburg, Malmö/Lund, and Uppsala. We use registerdata for the full Swedish-born population of young adults aged 18–28 living in Swedenin the years 2007–2013 and multinomial logistic regression analyses of migrating toeach of the four cities or migrating elsewhere versus not migrating. Our point ofdeparture is the paving-the-way hypothesis, which posits that young adults who havea sibling living at a migration destination are particularly likely to move to thatdestination, more so than to other destinations. Additional hypotheses are related tohaving more than one sibling in the city and to the gender of siblings living at thedestination. We find support for the paving-the-way hypothesis and an additional effectfor having more than one sibling in the city. Having a sibling of the same gender in acity matters more for moving there than having a sibling of the opposite gender.