DH's father is in the last stages of Alzheimer's. We have travelled abroad to see him probably for the last time. DS has autism and has never shown any empathy at alll. He walked straight up to his grandfather and took his hand. He's tried to feed him/bring a glass to his lips. He is constantly next to him physically touching him very gently. It's beautiful but it's also very much so upsetting DS. DS has almost taken it on as his own experience and I can't tell if I should stop him from visiting? DH thinks he should continue to visit as his dad seems to enjoy the comfort. I'm really torn.