I'm reading The Intelligent Investor by Benjamin Graham (4th edition) and there is one sentence that I just don't get:
... Ben’s father died in 1903, the porcelain business faltered, and the family slid haltingly into poverty. Ben’s mother turned their home into a boardinghouse; then, borrowing money to trade stocks “on margin,” she was wiped out in the crash of 1907. For the rest of his life, Ben would recall the humiliation of cashing a check for his mother and hearing the bank teller ask, “Is Dorothy Grossbaum good for five dollars?”
The only thing I know is that Dorothy Grossbaum is Benjamin's mother. Could you be so kind and translate the whole sentence to simple English?