Thanks folks.
It is as I had expected from a legal standpoint, up to my own internal model of the world what I am willing to offer.
Some more of the story.
Her father is dead (I paid a big lump of his funeral) and she is estranged from her family. As far as I can ascertain, this is between her and her mother. Oldest daughters v. mothers is a thing in all cultures.
During my dealings with the family I have managed to secure the remaining part of the family farm for my GF plus some another small piece of land etc.. Every time the family needed money and I was expected to contribute, I traded a chanot for it, rather than straight charity. I offered to pay a large wad the other day to zero the family debt for the other part of the farm, but they apparently already agreed to sell it. Thai rural families are easy pray for loan sharks and banks. I gain no benefit for this, but I do not doubt my GF (and subsequently her son) would have ended with nothing without my intervention, so my contribution insured some of her farm stayed in family (her) hands. From my point of view, this is me giving her money.
My deal with her explicitly excluded marriage, it was that I would provide for everything incl. the boy's education and her only job was to be a full-time mother and a faithful partner. She did a pretty good job on the mother front and since she is a great cook, they both eat well. I have been faithful and kept everyone under my roof and given them a cosmopolitan lifestyle when we are outside Thailand.
One issue now appears to be she feels inferior to other Thai women because she doesn't have an expensive watch, lots of jewellery, a big bank balance and so on. She has developed an inferiority complex versus what she perceives other Thai woman receive from their farang partners. She has built up a massive "princess entitlement" position and she's angry about it. This is quite a new development.
I could throw gifts at her, but my experience is that she treats ear rings that cost 20 THB the same as those that cost 10,000 THB. A mistake I am not willing to make again so she can play princess around other women for a while.
There you go, a bit of pointless rambling about some of what is driving me out of my own home. There are far deeper issues though, and there aren't solutions for those,. :(
Question: How can one reasonably hide knives from the chef?