Correct the mistakes in the following sentence: fred and his wife were angry with scrooge's visit..

The irony of your question is that the statement not only involves capitalization and punctuation errors but also is completely false.  An accurate correction of both form and content would be as follows:

Fred and his wife are surprised and eventually elated by Scrooge’s visit.

Let us first speak about the changes in form.  The correction above fixes the capitalization errors of the two characters’ names.  It also corrects the verb tense from past to present (because action within novels should always be spoken about in the present tense).  Even though the preposition “with” is not necessarily erroneous, it has been changed to the preposition “by” for clarity.  Finally, it corrects the final punctuation error of the double period.

Of course, it is the change in content that is the more important correction.  In the past Scrooge has never even accepted Fred’s request to dine with the family during the Christmas season.  Scrooge has always rudely rejected this personal request.  Scrooge showing up later to “beg pardon” is unexpected.  Surprise is their first reaction.  Scrooge has to explain himself.  This takes a while, so the word “eventually” should be added to the statement.  Through his explanation, Scrooge accepts the current offer, apologizes for past behavior, and admits to seeing his sister in Fred’s face.  All of these things inspire great happiness on the part of both Fred and his wife.