Can you claim father-in-law if he lives with us?

Yes, you can claim your father-in-law as a dependent if he lives with you and meets certain criteria set by the IRS. He must be a qualifying relative, which typically means he has to have a gross income below a certain threshold and you must provide more than half of his support. Additionally, he cannot be claimed as a dependent by anyone else. Make sure to review the specific requirements to ensure eligibility.