My nephew who was born in August 2018 has been on medicaid, Can i claim him as my dependent. For medicaid, would my income be considered for his eligibility?

my nephew who was born in August 2018 has been on medicaid, Can i claim him as my dependent. For medicaid, would my income be considered for his eligibility? my sister had zero income for 2018 and my brother-in law lives in Canada so i provided most of the support.