Hi C., my name is P. and I am the mother four beautiful children-11, 8, 6, and 2. What I have found that works for potty training my kids is to let them walk around withouth anything on. I have bought pull-ups for night, and for going out, but at home they are free as a bird. Some people may not like this, but believe me, it works. If you are home with him all day, you need to try everything. My 2 year old is now potty trained. I trained him in 6 months this same way. He walked around with nothing on, and I would tell him to go about every 15-20 minutes. You have to remind him to go, but once he gets used to going on a scheduled time, his mind will be trained to go then. I have never had luck with potty chairs. You sit them on the chair and wait for them to go, and they never do. The seat for the toilet will work for when he does go. I trained all of my kids on the regular toilet, but instead of buying the seat, I would put them on the toilet backwards with their legs spread open wide enough where they will not fall off. Let me know if this has helped in anyway. Good luck to you and your grandson, and good for you for staying home and raising "our" future. Again, let me know: ____@____.com