Maybe the difference b/w the daycare toilet and your toilet ??? i.e the height ??? im presuming they have the little kids toilets at daycare ???
It sounds like your half way there....it really does. Maybe get one of those steppy things...get him to put some toilet paper down toilet, and flush.....show him its the same kinda thing as at daycare......start a star chart for home toilet use .....
I dunno, my DD 2.5 wont HEAR of anything to do with TT....the toilet just freaks her out...and she wants nothing to do with the potty. Ive tried these things mentioned above....and we will get there....slowly though....
GL.