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This case is special. 我对income需要多少, 没有概念.

One parent works in US (TN visa) with salary much higher than US$50,000/year
-Yes if your parent has been living with you for the last 6 months and both of you filed the tax return together,

 Another parent works in Canada with salary much higher than US$50,000/year.
-No because this parent is not living with you.

21岁子女没有income, 行吗?


Can the parent in US file I-485 and 21岁子女 file I-130 concurrently?
要多少年?
-Yes.

Still within one year?
-Yes because USCIS takes time to process the I-130 and I-485, etc.

我听说TN签证和申请绿卡矛盾,
-Fine. But need to get the advance parole to travel, and no more TN to enter US after I-485 filing.

TN签证要转成H1B吗?
-Not need.
By the way, you had better find a lawyer to help you because you don't have enough knowledge about this issue.