Hi Frances, and welcome to Talking Point
A Lasting Power of Attorney will give your dad control over the finances, but I don't think it will help if assets need to be taken into account for care purposes.
We have just got an LPA drawn up for my sister and I to be dad's attorneys, should anything happen to him, but mum is too poorly to agree to an LPA for dad.
Our solicitor explained to him that because they held the savings and house as joint tenants, that mum's assets would form half the savings/house. To that end, she has advised dad to split out half the joint accounts into his name only, and we have served mum with a notice of severence, ie they are now tenants in common and own half a share each of the house in effect. This has meant that dad can put a codicil in his Will so that his half of the savings and house is willed directly to my sister and I, so if he dies before mum, the local authority doesnt snap the whole lot up for fees if she goes into a home.
If your mum and dad keep the house as joint tenants, there is no problem for your dad as even if your mum goes into a care home, he is still entitled to live in the house.
There are probably others on the forum who have better legal heads than me, and who can explain more succinctly. It is pretty much a minefield and you do right to start considering things now. My dad has only recently realised how much a toll on his health caring for mum has been. He has been in denial for some time...give your dad time, it is a huge thing to have to accept. If you can get all your research done now, you will be ready for your dad when he is ready to accept what needs to be done.
Good luck and please let us know how you get on
Vonny xx