Quite good
Now this is where weeks of playing Covert Action and messing with its crypto messages pays off. With some experience, those messages aren't too hard. However you might want to add additional hints to give those a chance who don't regularly fiddle with encrypted messages. Also I found the arrangement of lines confusing. It's sometimes difficult to figure at first glance whether a line of cleartext belongs to the scrambled line above or below. You really should tweak the space in between lines for more convenience.
As for the jokes themselves I found some of them quite tasteless like the one with dad making his children "pay" for the movies. Thus I rated you somewhat lower for humor.
As a hint for all those, who can't quite figure out the messages, look for short words. If you can locate two different two-letter words with the same ending letter, they are probably in and on or maybe an. As for the longer words, have the theme in mind. Words like husband, wife, man, woman and girl are quite common. So if you spot one that could fit, just go ahead and guess, you will notice in a few seconds if your assumptions lead to garbage in other parts of the text.