The purpose was to present a family capital typology based on Sustainable Family Business Theory II and to document its relative contribution to short-term firm achievements and long-term sustainability using National Family Business Survey panel data. Family capital was defined as total owning-family resources composed of human, social, and financial capital. Family capital significantly contributed to firm achievements and sustainability. In the short term, all family capital types explained 13.5% of gross revenue variance and 4% of owner’s success perception variance. In the long term, all family capital types explained 26.7% of gross revenue variance and 11.6% of owner’s success perception variance.
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