well-off family

基本解释

Children from less well-off families might find it difficult to afford a visit to a faraway place.
来自经济状况较差家庭的孩子可能无力选择遥远的地方游历；
They both came from large families — hers is a well-off Irish Catholic family from outside of Chicago.
夫妻俩都来自大家庭。她来自芝加哥的一个殷实的爱尔兰裔天主教家庭。
Most of the young people who get married soon after graduating from college are from relatively well-off families, and they long for a stable and comfortable life.
上海社会科学研究院青少年研究所的专家孙宝宏说：“大学毕业后就结婚的年轻人大多家庭条件比较好，他们渴望过稳定安逸的生活。”

The kiddie tax law was originally established to prevent well-off families from abusing the strategy of shifting unearned income to their children, where it would be taxed at a lower tax rate than their own.
FORBES: The New Kiddie Tax
Another group of researchers interviewed parents and children from 124 well-off white middle-class families in three English cities.
ECONOMIST: Private education
Republicans should have, in our view, done what they had done just a few months before, which is pass a short-term measure to delay implementation of the sequester, a measure that would have represented the balance that the public supports, asking the well-off and well-to-do to pay a little bit, not just seniors and middle-class families, and that then regular order could have continued as it is now, but without the sequester.
WHITEHOUSE: Press Briefing