I sent a response... we will see how they respond. I tried to be as polite as possible while still addressing my concerns.
"I know this isn't really any of my business since I am not buying the guinea pigs... but males can reproduce as early as 3 weeks, and females starting at 4 weeks. The fact that they are from the same litter, doesn't matter. If the boys are not separated from the girl they need to be (she is probably already pregnant if they are housed together) and probably should not be sold together. Pregnancy and child birth are very dangerous for guineas so I hope you separate the genders and keep a close eye on the female to see if she is pregnant.
Again, I know it isn't any of my business, but I would hate for anything bad to happy to these babies. Thank you for your time."