Hello @jelba As per Government guidance, the care home should be allowing you to visit your mum inside without having the vaccine, so suggest that you have a chat with the care home manager to ask why they are imposing this unnecessary condition.
Here's the guidance:
It is not a condition of visiting that the visitor or the resident should have been vaccinated. However, it is strongly recommended that all visitors and residents take up the opportunity to be vaccinated when they are invited to do so through the national programme.
I don’t know where you live but lots of people under the age of 50 near me have been called for a vaccination. My sister got hers earlier by booking through the NHS website and ticking the box saying that she is a Carer ( she is mums nominated visitor and main contact ). She was not asked for any proof.
As you have power of attorney, then I suggest you speak to your GP to register as a Carer then you can use the NHS website to book a vaccination. Or just go online and tick the Carer box and see what happens - worth a try as you are so close to the current cut off of age 50.