dreadful behaviour from 3 year old

[tea2sweeteners]

grandson 3 and a half years old, is driving his mum mad due to constant battles. He will not do ANYTHING he is asked, told or requested, Is never still, if sat down will constantly squirm and wriggle. Attends pre school 5 mornings a week , 8am -11-50, Some good days , some bad days. They had to give him a high viz jacket and a clipboard just to get him to behave at first, He doesn't like to be told what to do, has a very short attention span, seems unable to sit and listen for more than 2 minutes. HE IS VERY INTELLIGENT, only needs to be shown something once, and he 'gets' it. Seems 'old headed'. Been like this for over 6months, has a new baby brother (9 weeks), so it isn't because he feels left out, He has two lovely parents who adore him, dad works, mum on maternity leave. Very good homelife, but his constant whining and open defiance are very hard to deal with, very loud, very insistant, and sometimes very embarrassing, Worried that other mums think he is bad influence , which to be fair, at the moment he is, all this is depressing mum, she cries, is exhausted

[Soila]

Hi tea2sweetners,

Just a couple of questions:

You say he's been like this for over 6 months. What was he like before?
Did anything significant happen (apart from birth of new brother) prior to the 6 months?
Finally, have mum and dad considered speaking with their GP at all?

Thanks Soila.

[Discopanda]

My DD is almost 3 and has started to comprehend that we're about to have another baby, she's stopped sleeping properly and tantrums have got much worse since she started to understand that there's a baby in mummy's tummy, so considering you said he's very intelligent it could be that. A nanny friend of mine suggested that it could also be hormones.