This is a very tricky one, and must be so upsetting for you. I can see things from your son's point of view. If he takes a day off every time the baby has runny stools he will quickly run out of holiday allowance, and then what happens? We have this situation with my son's nursery. Every time our granddaughter has loose stools they call for the parents to collect her! Her parents both work, so this is quite a crazy situation. I have her one day a week and, due to the nursery's policy I absolutely have to have her if she has loose stools, and am very willing to, as 99% of the time 'loose stools' are not a problem. Also, you refer to 'our age'. He's right. Mid-60s is not old! (I'm late 60s.) You do say your husband had a heart attack a year ago, but I can understand him thinking you're playing the 'health card'. On the other hand, you have both been very ill from this 'Norovirus' and when your son says you 'lack empathy', I think it's a case of him lacking empathy! He should understand exactly why you feel unwilling right now to look after the baby if there is diarrhoea/vomiting! It's also very unfair of him to compare you to the other Gran, who after all only has the baby for half a day a week. I would gently remind him that you were both very unwell and that this does make you feel nervous of looking after the baby when there are loose stools. Hopefully he will then come back to you and say (on reflection!) that he does understand that. Hopefully then you will be willing to take the baby when there are loose stools and hope that you and your husband are not ill again from that - it's very unlikely. And of course if you are, then your son will have to change his childcare arrangements.