When Bob tells him he's going to regret what he's done, he spits in Atticus's face, and Atticus just makes a "smart" remark saying "i wish Bob Ewell didn't chew tobacco." He thought it was just Bob's anger speaking, he didn't think he would actually hurt him or his kids.
Bob Ewell, who is Mayella's father, beat her up
Bob Ewell or Mayella
Atticus suggested that Bob Ewell, Mayella's father, was responsible for hurting her. He argued that Bob Ewell abused and manipulated his daughter as a way to cover up his own actions.
He wants to show that Bob Ewell is left-handed, which goes along with Heck’s description of Mayella’s injuries. (meaning Bob probably beat up Mayella)
Her father, Bob Ewell.
jem
Bob Ewell had falsely accused Tom Robinson of raping his daughter, Mayella Ewell, which led to Atticus defending Tom in court. This created tension and animosity towards Atticus and his family in their small town.
Mayella Ewell.
Bob Ewell spits in Atticus' face out of spite and a desire for revenge, as he is angry that Atticus was able to prove his daughter Mayella was lying about the assault. Ewell's pride is wounded, and he seeks to humiliate Atticus as a form of retaliation.
In those chapters, Mayella Ewell's thoughts about Atticus Finch are complex. While she falsely accuses him of assaulting her in court, it is implied that she may feel conflicted about him due to his respectful demeanor towards her during the trial. Mayella comes from a difficult home situation and may have mixed feelings about Atticus, who treats both her and her father, Bob Ewell, with dignity and respect.
Tom Robbinson a black man convicted of raping Mayella Ewell :D
Atticus wants Mayella Ewell to admit that her father, Bob Ewell, physically abused her, rather than accusing an innocent man, Tom Robinson, of assault. He believes that the truth will come out in court and hopes to show that Mayella is not telling the whole truth.