I feel so sad for you. I can see this forming the basis for a rift in the family.
A close friend is a millionairess, (she earned the funds herself) and her father gave her younger sister, who wasn't affluent, the money for a semi-detached but beautiful historic house so that younger sis could relocate.
She was supposed to pay the funds back when she sold her existing house.
You no doubt guess what happened next. The sister sold her previous house and the father said she should keep the money from the sale, as he didn't need it. Cue resentment number 1. Younger sis had just been given a 500k house and still had her own proceeds from the other house sale.
Anyway, my friend's dad then wanted a new house himself, and he didn't then have the money left to buy it in cash; he'd need to sell his own house to be able to afford the new one, because he had given away the 500k!
But he was afraid the house he wanted would get sold meanwhile. So, he asked my millionairess friend if he could borrow the money from her, to fund the new house in cash right away. (All this while my friend's sister was now' sitting on' his own money because he had handed it to her).
This gets worse!
My friend loaned her dad the money for the new house, on the agreement he would repay the loan when he sold his own house.
It then turned out that the new house was the other side of the semi-detached where the younger daughter lived, the other half of the semi for which he had said daughter 2 could keep the cash! So, he had been planning to move into the other side of the semi to be next door to younger daughter, but was borrowing from my friend the cash sum so that he did not lose the house.
Then ... and it gets WORSE still!
The sister who already lived in the semi, (and who had been gifted by her father the hefty cash sum to buy it ... and next door to whom Dad was now planning to move) loved the other half of the beautiful old house as much as she liked her own. So, she started turning the two semis into one big house and she and her dad would live together in it! She knocked out all the dividing walls.
And ... it STILL gets worse!
My friend's father then decided he was actually quite happy where he was after all, so he would not move. He realised it would be a hellish upheaval to live in a construction site, so he would stay put!
So, he told his younger daughter she could keep the whole house, the two sides of the semi which she had now knocked into one, not at all giving thought to how a) he had bought her the first half of the house already and b) my friend had now paid for the second half, and the father wouldn't now be able to pay my friend back the loan they had agreed.
The privileged younger daughter was going to now get one whopping humongous house all to herself, (two kitchens, eight bedrooms etc) for no investment whatsoever, AND she had the cash from the sale of her own house.
Next thing that happened was that the two sisters fell out completely, vowing never to speak to one another again in their lifetimes. And my friend was out of £1m because half of that was the sum she had paid for 'dad's' half of the new house, and the other £500k was the sum that their dad had given to the other sister but not to my friend.
Result: A previously very close family became so fractured in a very short period, and when the father was dying, my friend could not bring herself to go and see him again because of this mess and the strain it had caused. So, he never got to see his elder daughter again.
And she then was the one who had to handle the estate after the father had died, at which point she used legal know-how to claw back the lost £500k she had loaned to her dad, but will never speak to her sister again. She hates her.
The long and short of it is that Mike, you need to confront this head on with your parents right now, and be frank about it.