Ok Peeps! I need some hardcore advice as I have no idea as to what to do.
Here's the scoop:
I have a boy who is turning 4 in June and is not even close to being potty trained what so ever. A couple things have lead up to this is 1) parents were never really active on training him up and until recently (and that kind of is a long stretch because I have a feeling that they are expecting me to do all the work - but that's another story). They just kind of thought he would just 'get it'. 2) He has been in pull ups for probably the last 4-5 months even though he wasn't even attempting to go in the toilet (Now I think he just associates the pull-ups as normal diapers).

Well they have started to potty train since the beginning of January and still we really have seen no progress in him. He still pees in his pull-ups, won't go unless he's prompted, and still puts up a HUGE fight to go on the toilet 50% of the time. We have had A LOT of successes though in the sense that he does poop on the toilet the majority of times and will tell me if he has to go. He still pees on the toilet (normally it's just a piddle though which made me start to think he wasn't emptying himself fully which was why he was still peeing in his pull-up).

When he does pee in his pull-up its not normally a full pee so I started to make him sit longer and also gave him a stool to put under his feet so he could relax but that hasn't changed anything. When he does poop in his pants he is embarrassed and hides in a corner. However, when he pees he is all smiley like 'you betcha my pull-up is wet'. I have stopped giving him any reaction to when he wets himself because I think he is trying to get a reaction out of me so I just take off his pull-up and put a new one on without being happy or sad. I give him stickers when he pees in the toilet and when he is dry and I try to make a big deal about it (But to be honest I'm running out of enthusiasm). I have even offered to the parents to put actual underwear under his pull-ups so that he can feel the wetness but they say 'it won't matter to him' - not sure if this is them just thinking that he will 'get it' again though. I honestly have no idea how proactive the parents are at home with him because they say they are but somedays I kind of doubt it because he will come in a full pull-up in the morning which shows me that he probably hasn't sat on the toilet since he woke up.

Today has been a bit difficult because he is refusing to go and I am tired of fighting with him so I'm just refusing to argue with him. If he wants to pee in his pants then I'm not going to fight him.

Any advice on what else I can do or should I just leave it to the parents to deal with and just keep taking him on the toilet every hour and hope one day it will click?
Thanks in advance