Dear Jeff,
I feel sorry for your situation.
As you filed a petition for her and her son and likely presented affidavit of support - by completing and signing a document called an affidavit of support you accepted legal responsibility for financially supporting your wife and her son. This legally enforceable responsibility lasts until they become US citizens or can be credited with 40 quarters of work (usually 10 years),
As long as her permanent resident status is conditional - her status depends on your marriage and relations; and based on further USCIS approval.
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