why did my dad go to walmart and not come back?

OK, these are a few of my sujestions.

#1 He's probably dead

#2 He probably went to jail for committing a crime (10 years in jail)

#3 He divorced mom then never came back

#4 He went invincible

#5 He couldn't find his way back home

#6 He still can't find what he is looking for so he can't come home till he finds it.

But Pray to Zues, Persidon, and of course Percy Jackson to help you bring your father home. If your dad is truly dead, pray to Hades to bring your dad back from the dead. May you have happy days with your dad.