CazB
Here's my two pennyworth of advice - call DIL directly and ask her if she'd rather wait until her 'project' is complete before you visit.
If she says "yes" then tell her that you will most likely recruit your younger son to drive you there. I believe that when people say they don't enjoy driving, they frequently mean that it makes them nervous. I stopped driving for that very reason - nervous drivers on the road are accidents waiting to happen. But I told people that I didn't enjoy it anymore.
If the house / 'project' is up to scratch and she still doesn't want younger son to step over the threshold then that adds another layer to the problem - but at least you will know that he is the problem, and not the house.
My gut reaction is that DIL is being rather 'precious' but - some things are very important to other people that don't hold the same importance for me - so I can respect that.
As for the pub lunch - not everyone enjoys entertaining, it is, after all, time-consuming, so I'd be quite happy with that arrangement - then no one has to focus on the food preparation or clearing up, which leaves more time for relaxing, looking around the house, and enjoying the family get-together.
If you are prepared to wait until the house is ready, this would be a possible solution.
🦞 The Lockdown Gang still chatting 🦞



