AITA for not stopping my dad's visits?

AITA for not stopping my dad from visiting my sister’s grave every night? After my sister

died, Dad started walking to the cemetery at 1:13 a.m.—the exact time of her

accident. He said she “called” to him. My family begged me to stop him,

since he only listened to me. One night, I followed him. He knelt by her

grave, whispering back and forth like someone was answering. Then he said: “I’m

coming with you.” And he walked toward the woods behind the cemetery. I should’ve grabbed

him, but I hesitated—he’s sick, and I was scared I’d make it worse.

By the time I moved, he was gone. They found him at dawn, collapsed but alive.