I don't think we can satisfy their needs, or even to a large extend, their basic needs. You think about it, their families are damm big, and if one person needs 30,000 VND for simple meals each day, and the family easily will have around 20 people. So its 20 x 30,000 VND x 30days = 18 million VND just for food each month. Then how about other needs like medical? Poor people always sick, poor old people even worse......
Better to state your terms and convince your wife of your ability. If want to support them all, i will rather be single