My grandfather usually claims my disabled brother on his taxes, but this year my brother is $14 over the max income to not file taxes can my grandfather claim my brother?

My disabled brother who doesn’t work and lives with my grandfather made $10,014 from his SSDI. My grandfather is usually able to claim my brother on his taxes, but this year he is $14 over the maximum income to not file taxes. My question is, can my grandfather still claim my brother, or do they each have to file separately?