Risk capacity
How much risk a family can afford to take, given its goals, liabilities and time horizon.
Risk capacity is the objective ability to absorb losses without endangering essential goals. A family may have a high tolerance for risk yet a low capacity, or the reverse, and the investment policy must respect the lower of the two.
The danger is a family comfortable taking risk but unable to absorb the loss without endangering an essential goal. A sound policy respects the lower of capacity and tolerance, which sometimes means taking less risk than the family would happily accept.