Is there any way to legally change your godparents?

I am frigging pissed!
 My uncle is one of the greatest guys I've ever met. He's always been my favorite uncle but that might just be because he's also my godfather. He's kind, hes funny and he does everything he possibly can for his family. So I don't understand why my stupid aunt would cheat on him.
We found out awhile ago. Actually I think its been about a year and ever since I just cannot understand it. My uncle is my moms brother so I guess I'm predisposed to like him more but even if it was the other way around, I think I'd still like him more. He's just a better person.
My aunt used to be kind of heavy (after 3 kids can you blame her?) until about 2 or 3 years ago when she lost a lot of weight. I don't know if that had anything to do with the cheating or not but somehow I'm guessing yes. I don't know how many men she's been with or how often its happened but I think she is the worst kind of mother and wife since she has a great husband and 3 kids - aged 18, 16 or 15, and I think 13.
The worst part of this, I think, is how her kids feel about it. I know what its like to have one side of your family hate a parent. Even before my parents got divorced, no one liked my dad. So since my moms whole family hates my aunt now I know how my cousins might be feeling and it sucks. You always feel like they secretly hate you too because your that persons kid. Who ever it is, they're blood runs in you too so doesn't that mean you're just as bad?
But anyway, I'm really mad because tonight my mom was talking to my uncle on the phone and I happened to be close and I heard him telling her about how things got worse. After he found out for awhile they were planning on getting a divorce but then they decided to try and work it out if she stopped and paid more attention to the family.. etc. I'm chalking this second chance up to my uncles generosity because my aunts to damn selfish to really care, I think. I believe she only sees what she'd be losing if it went to court because my uncle is such a great guy and she was the one that caused it. Today, however, my uncle started saying how my cousins phone has been acting up so he called Verizon to get him a new one and after going over all the general stuff, he was told that he wasn't allowed to make changes to the account and the only thing he was able to use or change was his own number and he couldn't be told certain information and all this other bull crap. And apparently, this has happened to him before, so he thought it was just Verizon screwing up (which if you face it, is a plausible explanation; just not the one I thought of). So he came home from work the next day and my aunt was already home and she was on the phone with Verizon trying to work it out. So at one point she said, "Hold on, let me put my husband on. He knows how to deal with this better." So my uncle gets on the phone and says, "Am I allowed to make these changes" and so on. So they tell him, "No." So he responds with, "Hold on, I'm putting my wife back on." So anyway, she was getting it all worked out and something happened and my uncle put 2 and 2 together and realized that my aunt had control of the account so he started asking her, "What are you hiding? What don't you want me to know?" She eventually broke down and told him that she had been texting and talking to the other guy on the phone. Then my uncle started telling my mom about how he promised himself when he found out the first time that if he ever caught her lying again, then he was done and it was over. So he did and now supposedly they are going to be getting a divorce and I am very proud of my uncle because it was my opinion that he should have gotten rid of her useless ass the first time around.
That just shows the kind of guy my uncle is. Hes willing to put up with someone like that just so his kids will have their mother around. And he said he sat them down and talked to them about it and I really hope they understand that he was the one that was wronged and that they don't resent him for this. I know how it would feel because, again, after my parents got divorced I was mad at my mom. I wanted both my parents there like they always had been. It took my years to realize that my dad wasn't an easy guy to live with and he still isn't because he hasn't changed a damn bit. But anyway I hope my cousins are okay with this and I think my uncles finally doing the right thing.

Oh, and another thing I have against my aunt...
When I was at work one day, I was in register and a group of firemen that always come in stopped in and they came through my line. Now, my grandfather on my moms side used to be the Fire Commissioner of Philadelphia which is like the top fireman in the city. (My great-uncle was mayor and thats how that all came about but he was). So every once in awhile when I'm talking to a fireman, I'll mention my grandfather. Most of them are old enough to know who both he and his brother were so they all know the name. But, back to the story, I mentioned it to this group of firemen and the one said, "Oh, so that must mean you're D*****'s daughter from St. C****!" (I'm blanking out names.) And this was after we had found out about the cheating so I gave him this horrified look and said, "God, no! Thats my aunt." And he chuckled and started telling me about how she was always the lunch mom for the elementary and how she was great with the kids and blah blah. But the thing that bothered my most about that whole encounter, and I really don't know if I was imagining it or not, was that he had this little knowing smirk on his face the whole time like he was thinking, Yeah I know who your aunt is. I slept with her even though she's married. I slept with J** R****'s daughter-in-law!" (J.R. is my grandfather, btw.) So everytime I see that particular fireman now, I always wonder if that was a guy she slept with behind my favorite uncle's back and then I don't ever want to see him in my store again and I hate her for making me think like that.