Boy??? Girl??? help needed asap

Ok so i just got my 2 baby chins
and i was hoping to introduce them to my adult rescue girl over time. I was supposed to have gotten 2 girls but i am pretty sure i got one of each. I dont want the bro/sis combo to breed nor do i want my old girl to get pregnant so looking to verify that i have bought me a boy and a girl. if so i will have to have the boy neutered. Any help greatly appreciated. here are the pics (sorry about the poop in the one
[ATTACH...

Boy??? Girl??? help needed asap