Need advice..

Okay, I'm a single mother of 2yr old twin boys... how in the world do I get the completely potty trained with me working every single day. When I pick them up we literally have time to fix dinner, eat and take baths. Their babysitter is supposed to be working with them on potty training but she's managed to go through 118 diapers in a week.... they know to pee in the potty. I just can't get them to tell me when they have to use the bathroom or poop in the potty. Need advice..