Bailey is the son of the grandmother, she is his mother and she bosses him around. He is a weak individual who does whatever his mother tells him to do. She directs him to take the family on a detour to see and old house from her childhood which results in tragic circumstances, the family is confronted and killed by a wretched murderer.
"In "A Good Man Is Hard to Find" all of the characters—most obviously the Grandmother—are concerned only with their own wants and desires."
Had the grandmother not been so demanding and insistent on going to visit this house from her youth, the family would not have encountered the criminal Misfit, the killer, and would still be alive.
The grandmother's ability to manipulate only extends to her weak son, Bailey, who wears a yellow and blue shirt with parrots on it, indicating that he is weak, or yellow and like a parrot cannot think for himself, but rather just repeats what others say, particularly his mother.
"Bailey seems unresponsive to his wife and children, allowing them to take advantage of him."