IN theory an IEP can call for parent participation....practice is more fleeting ...but instead of Dad complaining about too much XX at home....if the IEP identifies a problem and sets some guides as to out of school reinforcement of whatever...it might provide some better leverage ..weak as it may be.
OP , from what you post this child has severe problems and is failing to thrive academically ... a 504 is a weak tool, schools hate expensive IEPs .but check into same like tomorrow? And an IEP can also provide for some longer term services.as well as more individualized (expensive ) services ..otherwise the school may rush to " graduate " him at the earliest window,
SOrry Mom does not seem to get it...but deal with the cards you have .