Father's name has misspelling on his and wife's documents.

[G_Singh]

My wife wanted to apply for his father to come to US, but just realized that his name is spelled on way on my all of my wife's documents. And it is spelled another way on all of his documents. When I applied for my wife to come here, I had put her father's name as it appeared on her documents.

for example all of my wife's documents have father name as "DALJEET"

All of her father's documents have his name as "DILJEET"

Now that she wants to apply for her father to permanently come here, would this cause an issue? What should be done to fix this? (or do we just put one name under "other name" column?)

[Provence]

There're likely to be issues. Best to have the father correct names on his documents prior to petition submission.