I recently added some mods for the kids and parents rooms and since then none of my families have had twins or triplets only single births.. is that a glitch or something and how do I go about getting rid of these mods if they are messing with my families virility ??

I highly doubt a mod to the images would mess up the programming. If you still want to get rid of the mod, then you just have to put the original images back in the image folder.

how?

Oh... then you didn't take copies of the images before you installed the mod? Oh well, there's still a way. You just have to install the game again. The same way you did for the newer versions. (AKA, download the trial, install it, and you'll be ready to go - no uninstall required, I don't think)

well i did make a back up folder.. so I just put the pics in the original file?

and if I reinstall it, do I have to use the same site again? cause I bought it off of Gamehouse.com

I doubt it's the mods, I think you should try... While doing such, keep in mind that multiples are EXTREMELY rare.

If you made a back-up of the images, then yes, all you have to do is put those images back in the folder for the game.

Well, there is no relation between twins and mods.
I use mods, and I had twins

Yep, I have a bunch of mods and if multiples are extremely rare, I must have a really rare game cause I've got tons of multiples in my family. I do use the Baby Boost a lot though.