2. I show her websites that list the signs of when a baby is ready... I show her websites that say closer to the age of 3 is when they START to be potty trained. She just yells "THEY'RE WRONG. THEY'RE ALL WRONG. BABIES SHOULD BE POTTY TRAINED BY 2!"
Some babies are pottytrained by 16 or 18 months maybe MIL got lucky with those numbers. Our ped says that we don't worry about them not being potty trained until 4. My kids were potty trained DD 2.5 DS 3.5. Every kid does it in their own time!
Just be glad she's not in charge of potty training your children. My son was 3 when he was potty trained, I knew he was ready because he could stay dry all night and use the potty first thing in the morning.