thanks for your advice - I told her a year ago when it was all happening then that she should watch what she feeds him and take them too park - she says she done e numbers thing etc and uses sugar free juice but everytime ive been down they eating sweets from shop - everytime she goes to shops she has to buy them sweets - as far as I remember anyway
But I agree with what your saying 100%
She is out on the drink a lot, sometimes 3-4 nights a week and she I think she uses that as a 'vent' for her pent up stress from kids - but as you know this is all self-caused if she not prepared to get out and about with the kids to park and REFUSE them sweets that generally over time they will "slowdown" or at least be burned out and sleepy by 7pm or whatever!
Wished I could do something to help but I cant - I dont live near them and I myself am on chemo-like treatment at moment and have no strength so I cant even step in for her some days which is annoying
Some 4 year olds are pretty hyper. What your sister needs to do is just go with it and find some outlets for his energy. He needs to be outside whenever possible running, climbing, jumping and swinging (very calming). A park is awesome for this and is free. The other kids would benefit from this as well. I think the support group and couseling will be beneficial for your sister as she does sound like she could use the parenting help. I don't mean to be harsh by that, but she has three children whether she likes it or not and needs to learn to cope. Just blaming the child won't help her but actually allows her to not do what needs to be done here. Again, not meaning to be harsh. She's the parent and he needs her to help him.
With that said, my child has a developmental delay called sensory integration disorder that looks pretty hyper at times. Medication will not help. (and by the way, there is no magic pill that will fix behavior. It takes lots of work.) His therapy which has drastically changed behavior involves lots of physical stuff (hence, the park idea for you). The more active he is, the better his behavior. They also have early intervention preschools through local school systems in the US. Your nephew could be evaluated through this. (but, ADD/ADHD shouldn't be given as a diagnosis until a child is at least 6 as kids before this time are well known for hyperactivity and not being able to focas).
I wish your sister and nephew all the best and it is kind of you to want to help her. Good luck to you all.