Two Mollies, Which Is The Mother?

[Silentrunner11]

I posted last night about identifying weather my fry is a Molly or a Red Wag and you guys were a massive help (thanks again!). I have one final question for you, which of these two Dalmatian Mollies is pregnant...or looks the farthest along? I can't figure out of one is just fat, or if they are both pregnant.

The first fish in the video is "Domino" and the second fish (lots of black clusters of spots) is "Oreo".

Sorry I didn't get more of Domino, she's a very mobile fish...she never slows down. Oreo has always been pretty chill, just hangin' out. I just fed them, which is why they're still on the search of food. I think they know there's a little left in the breeder tank but they're still on the hunt.
 
Thank you in advance for ANY help you all can offer me again!
 
http/www.youtube.com/watch?v=NvsC8kYOtzc
 
(edit) I've been watching and neither are showing any real signs of a pregnant fish to be honest. The two Mollies here mingle with the male Molly and swim around together. They have no issues with the Red Wags in the tank. They all eat the same amount but tend to stay in their territories - Red Wags in the back right, Mollies in the front right and center bridge. Somebody mothered this fry, and if I can't find out I'm gonna have to bring in Jerry Springer!

 

[helterskelter]

How's this........perhaps it's not the male!
Your second fish is a male by look's of the anal fin.

 

[Silentrunner11]

Hm...second one is Oreo. I was sure it was a female due to it's shape, guess he's just a fatty! I must have been mistaken! I know for a fact it's not the third (unnamed) Molly, it's long and thin and looks like it has no stomach at all, and . I guess if I go off what you're saying then Domino is the mother. Thank you.

 

[helterskelter]

Look at the anal fin, it's pointed, this is called a gonopodium which only male's have and used to fertilise females

 

[Joshwainwright]

This diagram might help you and could be useful for future reference:
 

I'm not too sure by looking at the video, they're moving too fast for my eyes!
 
You should be able to sex them easy enough with this though