Start potty training. If your kids are old enough to start playing these games they're old enough to start potty training and have been for a while.

I started potty training my son at 13 months. There's a lot of sitting around and waiting, as with all potty training. Do not reward them with treats or toys, reward them with your happiness.

Be sure to tell them that poop and pee is yucky and gross and that you do NOT ever play with either of them. You play with crayons, paint, playdough but never, ever poop because it will make you SICK. Be very clear of your expectations of them. They won't pull this shit.

Source: My son is two and a half. Never plays with his poo and refers to it as icky and yucky. Goes pee on the potty often and feels very bad when he wets himself if he's without a diaper in between the pool and home.

Potty training tips: The more fluid your kid drinks the more often you'll be running them back and fourth to the potty. At a certain age start taking their diapers off and showing them that they're not wearing a diaper. Make sure they know what diapers are for, to make sure you don't get pee everywhere. Talk to your kid's like they're adults, not like they're babies. Let them know what you want from them and reward them with your smile and praise when they do good. They will want to please you then and will keep doing little things to make you happy. If they're doing it wrong, tell them. Tell them flat out, that's wrong. Don't help them do small things. I spent 20 minutes the other night staring at my kid because he was told to take his shirt off and was being whiny. He got stuck in his shirt and told me to help him and I said no, you can do it yourself. When he finally got it off the smile on his face was so big and I was so proud of him. He now insists on taking his own shirt off and he's great at it. It was SO hard to watch him struggle, but I knew he could do it by himself. Kid's are much smarter than anybody gives them credit for. Also, just buy a potty ring for your toilet. Don't give them special potties unless it's a travel potty that you need for going out. Potette Plus for me and my son. Going on the same toilet you do helps them understand that going to the bathroom on the toilet is what everybody does and soon they'll be wanting to show you they can do it on their own.