Theory:

Do they live with other people
Have they mums and dads?
And were they ever children
And were they ever bad?
Explanation:
 
The child probes whether the teachers lives alone or with people around them. This might be due to the fact that other than the interaction he has with the teachers in the class, he knows very little about their personal life. He does not know about the place they live or their likes or dislikes. But he is curious to know about it.  He wants to know if the teachers who is an adult, has parents like him. Parents usually scold children when they make mistakes, to guide them in a proper way. He wonders if the teachers who scolds him and is considered as a superior to them, also has someone who scolds or controls them.
 
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Child meeting teacher with parent
  
The child innocently ask if the teachers who is a grown up individual and who guides children now was ever a child once. This question ponders more into the childhood life of the teachers. Being a child themselves, they are aware of the little pranks and mischiefs that they have made along with their friends. He is surprised if his ideal teachers ever did them. It is not possible to imagine the teachers who are considered to be perfect, as someone who forgets to do his homework or fails in a test. This is probably why he asks whether his teachers was ever a bad child. When he had been naughty, his teachers had called him a bad child, but he wonders if it was possible at all for the teachers to have done the same, as a child.
 
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Child being told about bad behaviour
  
Meaning of difficult words:
 
SI.no
Words
Meaning
1
InteractionCommunication
2
Superior
In higher position
3
PondersTo think carefully about something
4
PranksTo play tricks
5
MischiefNaughty behaviour
6
IdealPerfect
Reference:
National Council of Educational Research and Training (2006). Honeysuckle. Where Do All the Teachers Go? - Peter Dixon (pp.67- 68). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.