Thank you everyone for your suggestions about my trip to Australia, which I will certainly bear in mind. I suspect that I will need to visit again, if I am able to, as there will be limited time to see as much as I would like to see. As it is, I will be away for a month, and I am worried about being away for longer from my dog, who is an old boy now and developing some health problems.
Thank you also for the advice about replying to LB's DM. I eventually sent a message yesterday afternoon, along the lines suggested, friendly, saying I thanked them for taking the boxes, hoped they wouldn't take up too much room, wished them well with the renovations and said it sounded a busy and challenging time, asked them if they had any holiday plans etc.
I received a reply about five minutes later, saying no problem about boxes fitting into camper van, they were thinking of visiting some places in the North, such as the Giant's Causeway, as it was a long way to drive and expensive on the ferries to spend two days with LB and DD1. She also said her DD had visited NZ and loved it, although they had never been outside Europe, and again wished me a wonderful trip.
From this I infer that they have been told that they may visit for a maximum of two days, and not until March. DD1 previously told me that, in the list of 'grievances' set out by LB in an email, they had also been told that they would need to help with the cooking as it was too much for DD1, and not to overstimulate the DGC. In short, they have been made to feel so unwelcome, that it is testament to their love for the DGC that they are going at all. Interestingly, the last message to me said that they had not seen the DGC since last July, not that they had not seen LB and DD1 since last July. So I suspect that DD1 is right when she says that they are only interested in the DGC and not in them.
TicketMasterMind and Tribpot - I am indeed being cautious. I wouldn't say that they were 'happy' to see us 'out in the cold' before, as they had no way of contacting us and LB made it clear that he did not want us to be in touch. However, the first time we visited, they made a point of contacting us at our hotel, sent flowers on DH's death, a card when DGS was born etc.
billy1966 - I think you are right. LB's DM told DD1 that he was 'difficult' quite early on in the relationship, and DD1 thinks LB is very like his DF and DGF, both of whom apparently would choose to be social recluses if they could - in fact, the DGPs already are, but then they are old and frail. It is clear that LB's DP are much closer to their DD and I suspect that, if she has DC, the new DGC will become the focus of their attention, especially as they are so unwelcome in Ireland.
LB likes to control and nurses a grudge. My personal view is that he is using the DGC to 'punish' his DP for perceived or actual past slights and for favouring his sister. At least when I have visited in the past, DD1 knows that it is because I want to see her as much as the DGC, so have welcomed spending time alone together. I was actually quite pleased when the arrangements were abruptly changed last time I visited, so Day 2 was spent with DD1, although I felt sorry that I had broken my promise to the DGDs to return the next day. However, I suspect that LB assumed that I would be like his DP and upset not to see the DGDs, so he deliberately changed the arrangements.
Goldpaw - that's good advice. A short and friendly response will follow later. I am getting better at sitting on my hands! Although I was quite tempted to sympathise with them on the cost and trying to combine a visit with a holiday. At least they are able to drive. In my case it costs upwards of £500 in taxis to and from the airport etc, plus flights and accommodation, in order to see my DGC and DD1 for maybe 10 hours in total (last time I saw the DGDs for about 5 hours). They are about two hours' drive from Dublin, where I would much prefer to stay, as I could be there for longer and it is a lovely city with plenty to do and see. I would even be happy to arrange a hotel for DD1 and the DGC for a night or two, if LB felt his responsibilities kept him at home, but I know he would never agree to it.
Wherearemymarbles - yes, there is a strange sort of reassurance in knowing that it is not just me they have a problem with, it is basically everyone, apart from the neighbours, and who knows how long that will last!
FerretInAFrock - I don't think there will be time to visit the Margaret River. but hopefully I can sample their wares! I have recently done a wine tasting course and the Margaret River featured in some of our tastings. 