GW that must be difficult for your sister knowing that an intervention could have possibly sorted it out years ago. I never want to be in that position.
Thanks for sharing Rakker. I have personally have never had a problem with taking my son to an OT. In fact it is something I have been wanting to do for over a year now.
When I say my DH is against it let me just say that we have nearly come to blows over this! I eventually managed to drag him to the pre-assessment interview and he is feeling marginally better about it and has agreed to do it. I agree that it can do no harm.
The OT's approach is 2 shorter sessions plus a session observing him at school (play group) which I think sounds quite thorough.
Funnily enought that what you mention are a couple of things I'm getting that there are issues with - balance, motor skills.
Frankly I'm pretty sure we could all benefit from some OT

My balance for example is not particularly good BUT it does not prevent me from functioning optimally. If I haven't reached my full potential it is not because I don't have the ability to do so. So I see it as checking to see that all the building blocks are in place so that he can reach his full potential. And not that there is something "wrong" per se.
At the moment I share my son's frustration which is evident everyday because we either can't understand what he wants from us or he can't do something that he knows he should be able to do. At least there are no issues socially or emtionally for which he gets full marks.
I'lll let you know how it went and whether anything was picked up.