Previous studies have convincingly shown that employees' family lives can affect their work outcomes. We investigate whether family-to-work interference (FWI) experienced by the employee also affects the work outcomes of a co-worker. We predict that the employee's FWI has an effect on the co-worker's outcomes through the crossover of positive and negative work attitudes. Using a sample of 1430 co-worker dyads, we found that the employee's FWI had a positive relationship with the co-worker's sickness absence through the crossover of feelings of burnout. Similarly, employee FWI was positively related to co-worker turnover intention through the crossover of (reduced) work engagement. The results show that family matters at work, affecting not only employee but also co-worker work outcomes. (Contains 1 figure and 2 tables.)