How do I get a purchase offer?

Probably one of those, "you moved away and I cared for the parents until their death, so why do you want to have a say in what happens with the inheritance now!?" things. Difficult situation, but it happens a thousand times. I see it this way, if you don’t start a conversation, everything else is a waste of time anyway, you might as well just work towards the forced auction.

Alternatively, he can just pay you out ;-) Then he doesn’t have to sell, but will have the house at his disposal. I would simply offer him options. And if he thinks doing nothing solves his problems, then just apply for a forced auction. Apparently, the relationship can’t get any worse anyway.

Yeah, or you agree on 60:40 or so in value or sale for family peace. That will be seen when a conversation arises and it becomes clear what the brother actually wants. Especially if the brother himself wants to stay living in the house, I wouldn’t insist on the maximum profit.

I would wait. Be it one year, be it longer. When the bills come in, he can consider what to do with the house instead of constantly paying bills.

in which postal code area is this possibly to be acquired property located? ;)

He is supposed to pay you otherwise auction