Thanks everyone who has replied, especially at such an unearthly hour.
Yes, I do have pets, a dog and a cat, who are a comfort to me, as well, of course, as my other DDs, but I am not going to burden them with this. We do not speak of DD1 unless they ask how she is. I will not let this spoil their Christmas and will be happy and jolly with them, although we miss DH still, of course.
The argument is not about deliveries. My understanding is that Amazon deliver to Ireland, although more limited items, as do Cambridge Baby. I think the problem is not even so much that tax is payable, but that parcels get stopped by customs or don't turn up.
The argument arises from my getting upset over the crosses and saying the things I said, including that she had never really explained why she had cut us off and not told us about DGD1, only that LB had told her to, which wasn't even the beginning of a reason - that nobody who really loved someone would want them to be cut off from their family. I said I was 'surplus to requirements' and when she told LB about our conversation, he would make her cut me off again. And of course that is exactly what has happened.
I even recognise some of LB's words and phrases in the latest message, which echoes earlier communications. The modus operandi, messing people around on visits and dates etc, is also totally predictable. Fortunately, I can cancel the hotel, taxis, pet sitters etc, so will only lose the cost of the flights, but they don't know that. To be honest, part of me is relieved that I don't have to go. I am never comfortable when he is around, as he's like a spectre at the feast.
I wasn't planning to reply to the message, as I will be communicating with LB, not DD1, which is what he wants. I actually feel very sorry for DD1 in all this, as she was genuinely so happy to have me back in her life and was so looking forward to my visit.
I don't know about the gifts and other stuff. I don't want to let the DGC down but, realistically, they are too young to know, and I don't have the emotional energy to deal with this right now.