There are a couple of different ways your brother-in-law may be able to qualify for Medicaideven though his assets are over the usual allowable limit. Depending on the rules of the state where he lives, he might qualify for Medicaid if he's considered "medically needy." More than half the states have this category. He could be medically needy if his current or expected medical expenses would force him to "spend down" his savings to below the regular Medicaid asset limit, even though his savings are now higher than the limit. To see if he would qualify as medically needy, he needs to bring records of all of his current and expected medical care, and the bills for them, to his local Medicaid application office.
Another way for him to qualify would be for him to shift his assets into forms that Medicaid doesn't count when determining eligibility. If he owns a house, he could use some of his savings to pay off or down the mortgage, or to make repairs or improvements to the house. Once the assets are invested in a house he lives in, Medicaid no longer counts them. The same is true of a car. If he bought a new or newer car, the value of the car would not be counted as an asset.