Your children don’t want to see the reality of his condition, possibly in denial, because they aren’t ready to accept his poor health.
So sad that He is in such terrible shape! I’m sorry he has so many health problems and a bad attitude - that makes everything worse! Maybe next time he needs to go to the ER, call an 911 instead and then he will be in the hospital and will be tested for his ailments and may be entered for observation or whatever. You can ask for tests from your doctors whenever you feel it is necessary. You see what others cannot see, you are his eyes for him. I believe he should be in the hospital. You and Robin must be a nervous wreck with all of this going on. I pray you both are taking care of yourselves and finding some comfort.