A passport is issued by the home (foreign) country and generally valid for 10 years. Inside the passport is generally a visa, that is what controls the entry to the US and type of activity allowed. At the port of entry, the applicant is given an I-94, a small white index-card like document which controls immigration status and date of stay. Most are valid from 6 months to 3 years at a time. there are no nonimmigrant visas and I-94's that allow someone to stay in the US for 10 years continuously. Extensions are generally filed and usually time limited to a maximum of 5-7 years.
Some countries are visa exempt for visitor visas. They get green I-94's. What country is your sister-in-law from?
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