The flip-side here; my parents said they'd like to live nearby. A new group of houses were being built locally, so we sent details, prices, etc and back came the answer that they'd like to buy one.
We asked again and again if they were certain. There were public access issues with the garden and my DH said that personally, he wouldn't touch it with a barge-pole and still they said that they wanted to proceed. In the meantime, they put their UK house on the market.
We oversaw the building project and the legalities, of which there were many. The payments were due on the first two (of seven) stages and were paid by my parents. Then, as their house didn't sell, the remaining stages needed to be paid by us. We asked again if they still wanted to continue, as it would require major financial restructuring on our part (remortgaging our house, pension payment readjustments, using all of our savings, etc). Yes, came the reply. OK, we said and paid the remainder of the stages, taxes and legal bills.
Then they changed their minds. 
As they were in the UK, it was up to us to sell the house but not before we had to pay for the build to be completed, utilities connected, etc, etc. Then pay to sell it, power of attorney, taxes, more bills and financial crap.
Four years later, I am still
but my DH, who is of this neck of the woods, was remarkably laid back about the whole thing and it only makes me love him even more. The moral of story; make absolutely sure that they really want to move and that you have a huge shovel to tidy up the mess when they don't . Grrr.