Thats exactly what I have felt, we just make some progress with DS2 then along comes MIL and we take 3 steps backwards. I will talk to dh again and ask him again to talk with his mum. Its a bit of a cultral thing to not challenge your parents though and she is always complaining I am rude to her. I must make more effort to learn the language so I can atleast say what I want in a better way.
Extra cuddle time would probably do both the boys good