It is difficult to know if your 2 year old is just going through the so-called 'terrible twos' or she is truly over-active. She does seem to be extremely active and seeing you are concerned about her mother possibly using drugs it would be best if she was seen by a paediatrician with an interest in developmental paediatrics.
I am concerned about your 5 year old not talking yet. Please have him seen by a speech therapist.
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