Yes, you can claim your inlaws as dependents.

Here are the qualifications:

·       You provided more than half of their support.

·       They made less than $4,150 in gross taxable income. 

·       They are not a dependent on someone else’s taxes.

·       They are not filing a joint return with someone else.

·       They are a U.S. citizen, resident alien, national, or a Canadian or Mexican resident. 

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