Bring Ruan to the UK

My son is 21, he had a near-drowning accident when he was 4, which left him totally dependant on others. He is extremely healthy otherwise and is a character of note!! We adore him but are aware that we cannot be there for him forever. We need to die in peace one day, knowing that he is well cared for. To bring him to the UK is very expensive, just for the correct documentation (I cannot transfer to him as I wasn't born here). I am working in the UK as a live-in carer, going home now and again, but I cannot go on much longer without being with my son. I am asking for assistance so that we can get him over here as soon as possible (and his dad of course). It will take me so long to work to get together sufficient funds, that is why I am asking for your kind assistance. I'm sure all the mother out there will understand my desperation to be with my son as soon as possible and I thank you in advance!!