Really sorry about your Dad.
Would you and your two brothers consider giving the stay at home brother say €3K each as a gift from your proceedings once the money has been distributed. He would be €9K better off and the estate might end up not spending thousands getting him out.
it sounds as if you have all spoken to him several times and the only solution he sees is continuing to live in the house until he is eventually forced to leave.
So lots of
So thankful that you were there for Dad in his last year.
Potentially saved us thousands in nursing home fees
So kind of Dad to let you live there for free for so long
The will was Dads dying wish, really need to honour that.
Basically just don’t mention unreasonable, stubborn, difficult, being a pain, etc, etc. A smallish financial pain for each of you might save thousands and months and years of it been drawn out.
The solicitor sounds like he is moving slowly so he will take loads of time to move the brother out. He will probably wait until probate has been granted to put the house on the market. (12-18 months if he gets push back from the brother on supplying details or allowing bills To be paid, valuation to happen or bank statements to be found. (my brother in law refused to give his pps number because he was still grieving….). The he will write and ask him to leave so the house can be put on the market, maybe 2/3 letters over the next 6 months before he threatens to take him to court to force vacant possession. So 2-7 years or any time in between. A few thousand euro to the brother might work wonders!!