Thank you everyone.
CraftyYankee - thank you for your supportive message. I am ok now, well largely, I think.
SirVixofVixHall and IScreamatMichaelangelos - I agree entirely. I do think that children can regress when with their DP, however old they are - as indeed an entire family dynamic can be replicated, which is why there are so many tensions when families reunite at, say, Christmas. My DH was also unfailingly polite and kind to my family, which is one of the many reasons why I loved him so much.
I think DD1 may have the beginnings of remorse, especially since she lost her Dad, but LB moves into action swiftly to stamp it out. This causes DD1 to feel anxious and stressed, but it makes for an easier dynamic to blame me for any tensions or 'problems' in her marriage. And this makes the solution simple - remove me from the equation and all will be rosy again in the Garden of Eden.
Yes, they have a few electric radiators and a wood burning stove so, whilst cold and uncomfortable, they are not going to perish. I am also old enough to remember ice on the inside of the windows! 😂
BadNomad - I agree that DD1 appears to be putting LB first, above her DC. She should be insisting on having the boiler fixed or a new one installed and telling LB that she will arrange it if he doesn't. However, she genuinely seems afraid to stand up to him and now, of course, she has no access to money. It infuriates me that, having had a substantial inheritance, she has no financial independence whatsoever and, presumably, has to ask his permission to buy anything for herself or the DC. I assume that the child benefit, as well as the new farmers' allowance or whatever it is called, is being paid directly to his bank account, since she no longer has one.
legofrostqueen and SquishyGloopyBum - thank you. I haven't replied to the WhatsApp and have no present intention of doing so, even if I'm not blocked.
I have ordered some items from the list which DD1 sent me for the DC's Christmas presents and DGD2's birthday, which were available through Amazon. Not all were available to Ireland, but the website did state clearly which items were or were not available. I didn't have them wrapped, so DD1 will have to sort that out - or perhaps there will be another message saying that they are no longer required and what should she do with them. I actually don't care - but it felt right to send the DGC their gifts. I will also be posting DGD2's birthday card, although it won't get there in time.
In the meantime, I have a pile of duplicate items, which I can unwrap and arrange to return to Amazon for a refund, or I may just donate them. In any event, it is all hassle and inconvenience. I think they are genuinely oblivious about what effort is involved or uncaring about other people's inconvenience. DD1 told me in terms that I was less of an inconvenience - or words to that effect because, when I visit, I stay in a hotel and get taxis to their house, unlike LB's DP, who come in their camper van and park at the property. They actually offered to stay at a nearby campsite, apparently, but DD1 felt that they couldn't really let them do that. However, she does find it a burden when they come, probably because LB doesn't help but leaves it all to her.
burnoutbabe - I agree that DD1 must realise that she could leave LB, but she still appears to be in thrall to him, to the extent where everyone else is superfluous. Actually, she was genuinely delighted to be back in touch with me but, for the relationship to continue, I need to buy into their perfect family narrative and love LB, which I just can't bring myself to do, however hard I try. Deep down, I think DD1 knows this, which is why she says things are 'fake', even though she can't articulate it.
DD2 and DD3 have no idea what head space DD1 is currently taking up. As I have already said, I don't discuss her with them, apart from briefly with DD2 occasionally. I spent a big chunk of yesterday helping DD2 with a claim against her builders, as I will do today.
Glindara - thanks for your excellent advice, as usual. You are right, I don't find joy, comfort or peace in the relationship. That is why these threads have been so helpful to me, by validating my feelings. I should feel joy in the DGC, in particular, but although I do love them, I am afraid to become too emotionally attached, because I know it can be used against me, as it is with LB's DP.
I am sure that LB and DD1 are wringing their hands and thinking what a fool I am to have 'blown' the opportunity to spend time with their family so near to Christmas and DGD2's birthday, and I know DD1 was really looking forward to it. Honestly, I am so relieved to be warm and comfortable here in my kitchen, with nobody to worry about apart from the pets and, as I had planned to be in Ireland, I have nothing in my diary until next Thursday.
Chulainn, Lunde, Nepoyeah, DPotter and BattleofBeamfleot - I am sure that you are right and that DD1 is either not aware about what is available in Ireland or is just not 'allowed' to have it, although I think that the main problems have arisen with parcels which have been posted from the UK because of the customs/duty aspects. It would be so much more sensible for her to just buy things over there. However, their mindset appears to be that it is always better to get something for nothing, whatever it may cost someone else.
Lunde - Thank goodness your DD1 eventually escaped!