Families worldwide have been undergoing rapid changes with macro, social and economic trends. Demographic shifts, economic upheavals, changing societal norms and values, immigration across national borders and migration within nations are creating new and altered structures, processes and relationships within families. The increasingly complex and diverse family structure contributes to concerns regarding the well-being of families in Hong Kong, including their health, happiness and harmony (FAMILY 3Hs). Family life and health education should be strengthened to meet the increasing needs of promoting healthy lifestyle among Hong Kong families. The results from the baseline findings of FAMILY Project Cohort Study (2014) revealed that only 27.9% of the participants considered themselves to be 'happy', while 15.6% of the participants were classified as 'unhappy'. Nearly one-third (30.7%) of the participants reported having experienced at least one stressful life event in the previous year due to heavier workload (10.8%), serious health problems of a family member (6.8%), worsening financial situation (6.2%), health problems of oneself (5.1%), or death of a family member (4.7%). Furthermore, more than half of the participants (52.5%) reported having some source of dyadic conflicts with family members. In response to these changes in the contexts and nature of the family, the Fitter Families Project (FFP) with a focus on "FAMILY Holistic Health", will be conducted in order to increase the awareness of the importance of FAMILY 3Hs.