My son is seven years old, single mother, CET-6, and has no skills at home, with total assets of 3 million. Considering immigration, I don't know which country is good or what.

This matter is very complicated to say. There are two ways for single mothers to immigrate, one is marriage immigration, and the other is investment immigration. If marriage immigrants are divided into fake marriage and real marriage, the cost of fake marriage is very high, at least several hundred thousand RMB (the specific cost varies from country to country), while the cost of real marriage is much less, only 20 thousand RMB to 30 thousand RMB. But the fake marriage time is fast, but the real marriage is much slower. Then, investment immigrants are divided into different types in different countries. Some small countries require to buy their own national debt, some countries require to set up local entities, and some countries only require to buy a house locally, that is, to buy a house. I don't know what requirements you have for countries that want to immigrate. Different countries have different requirements, depending on how old you are in China and what kind of work you do. Whether you have applied for a visa from any country, and whether you have gone abroad is confirmed.