Baby Showers And Godparents?
All right…
I’m not close to any person in particular outside my safety net, which is compromised of family members only.
My SO and I are having a baby party as opposed to a shower because I hate the idea of being in a room full of females… I don’t really relate. So, testosterone will be in attendence. My fisrt question is, etiquette aside, is it wrong for my SIL and his mom to cohost so we have equal representation?
Moving on to the morbid details of choosing a guardian and back-up guardian should the horrible happen, what if my SO and I are completely disagreeing on who should raise our offspring should we both meet an untimely fate? I hate to think about it, but I’m one of those “always be prepared” kind of people.

In answer to your first question: it is totally appropriate and probably welcome to have both sides of the family represented.
As to the second question: Maybe you could each pick a guardian and then if something should happen to you whomever is in a better situation to take care of your child gets custody. You can add this provision to your will. Some things to consider are: how many kids does the proposed guardian have at the time of your demise, are they financially capable of supporting another child; do they have room in their home; will they be able to provide money for college, etc. etc.