Oh I've so been here! A few years ago I was caring for a preschooler - he was born addicted to crack, mom gave him up and dad has been in jail basically all his life, so his paternal grandparents were raising him. I tried SO hard to get them to see something was wrong and they just continually made excuses. I finally terminated and strongly suggested they get him evaluated within the school. Well, two years later he has been diagnosed as on the spectrum, ADHD and SPD
parents and guardians who are in deep denial like that won't listen to anyone. I've found that for whatever reason, educators are especially bad at acknowledgement of developmental issues - like that couldn't POSSIBLY happen to their kid. Except it can and they of all people should know the value of early intervention!
I say terminate before something tragic happens!