Long time lurker, first time poster (on E) here...
1. My mother seems to be under the impression that when addressing STDs to some of my cousins, that if they aren't engaged or living with their SO, that I should just put "& guest." Her logic is that they could break up. Obviously if they broke up between now and when invites go out, I wouldn't put their ex on the invite. Anyway, what is the proper way to address the STDs? Also, if I do include the guest on the STD, they break up, do I include "and guest" on the invite since I was accounting for that person anyway?
2. My mom asked me for a rough estimate for shower guests so when she starts looking at places, she'll know where to start. FI and I both have female relatives out of state that are unlikely to come to the shower and then make a second trip for the wedding. Does inviting them to the shower (knowing they probably won't come) come off gift grabby or is not inviting them rude because just maybe they have money to throw around and will come?
Sorry if that was a bit long and technically more than 2 questions.

I know you ladies will give it to me straight.