Just a good response to your MIL, I guess.
DS has eczema, and when he was about 1 yrs old,MIL told me that she knew somebody with an eczema child whos was trained at 5m. So I said: Wow! very impresive, been potty trained even before he can sit on his own-
Sometimes afterwards she told me that her late DH was potty trained at 8m, and he was also able to to say popo please. Again, I believe this family must have been made of genious as the child in question was not even walking.
So... don't stress yourself about it, it;'s better to wait until they are ready, good signs include walking, been able to obey simple orders and point to parts of their body, being able to put down/up their trousers is definitively a plus, and stay dry for at least two hours.
I think DS (25m) is showing most of the sign but until he learns not to place the potty on his head I'm NOT allowing him to use it without a nappy!!!