Need help untangling lockdown rules

I really wish people would stop thinking in terms of "permission" and being denied something.

People are being protected for their own good and to attempt to stop the spread of infection.

In a six person meet up in a garden, there is still supposed to be social distancing. Personally, I can't think of anything worse than having a conversation in a group of people all sitting two metres apart, but each to their own.

If the child is running between all adults, there is a risk that s/he could be a carrier and pass infection on to all of them. I agree with Janipat. I would decline the invitation because it would be too confusing for a three year old.

Yes Furret, your interpretation of the rules is correct. For that reason, if I was your friend I would decline the invitation and go separately another time. How confusing for a three year old to have all three of their grandparents gathered, but only be allowed to cuddle and have physical contact with one. It will be hard enough when they visit separately.

I've come to the conclusion that it's all about using your common sense. If you feel ill then isolate. If you're well then live your life. Try to social distance in public but if you want to hug your grandchild then cuddle her. Maintaining your mental health is just as important as your physical health.