Hi, welcome to silkysteps. Parents, carers and colleagues might not want to communicate with you if they have concerns about your response and/or your professionalism.
Page 2 of the handbook preview will help - on
amazon.o.uk
Barriers to communiation might be ..
Language used - use of jargon, where English is not a first language, where sight & hearing impairment is involved or accent, use of local dialect causes difficulty in understanding.
I hope this helps, best wishes & enjoy the site