Hi Jenny
Good idea to try to brainstorm some solutions. Not saying any of these ideas is necessarily the best solution...nor am I suggesting anything but entirely loving and proper motives to your proposal.
I'll give this some thought over the weekend...but here's some initial points.
1) One point of view may be: What do your Mum and Dad get out of this? It's THEIR house, they paid it off, they should have the entire benefit of it whilst they're still around.
2) Is just selling the family home an option? No doubt there's a lifetime of happy memories attached to it and a lot of emotion...but does your Mum need to be banging about in the house by herself? Perhaps a smaller apartment/townhouse near your father's nursing home would be a better option? The surplus proceeds would fund Dad's nursing home fees plus some lifestyle for a few years at least...and then maybe your mum downsizes again...to be in the home with your Dad (just speculating here)
3) Reverse mortgages are an option (an expense and inefficient one in my book, but deserve to be considered). Make sure if you think about going down this path that you ONLY go to a reputable bank of financier and that ALL they get is a mortgage and there's no SALE involved...
4) Identify exactly what the problem is. Do your parents need to find the $7kpa or do they just want more cash for lifestyle spending?
5) Looking specifically at your proposal:
The advantages:
a) sale of family home is CGT free
b) home in family trust permits flexible distribution of both the rental income and ultimate capital proceeds from sale (but will then be subject to CGT)
c) your mum and dad have a big lot of cash proceeds from the sale (but probably this money does a round robin and ends up funding the purchase by the trust (at least partly).
Disadvantages:
a) depending on who the trustee is, you mum and dad have perhaps lost control of their asset (altho that's okay if they get a market price for the sale and keep the proceeds - note comments above about round robin)
b) any interest on borrowings by the trustee to buy the home as an investment property will NOT be deductible unless your mum pays a market rent - which she probably can't afford in a $750k house
c) there may now be land tax payable on the house
d) there will be stamp duty on the sale
e) the trust involves set up costs
f) your mum and particularly your dad may not want to be bothered with all the admin hassle of the trust (although no doubt you can help them).
Just some food for thought...
Cheers
N.