I have a neighbour, (not next door, but opposite and down the road) who I know has some special needs. He lives alone, so obviously reasonably capable, and a job. I don't know what "label" his special needs would have. Just to put you in the picture.
He has a cat. His cat likes wandering. He likes to knwk where his cat is. This involves crawling around under the garden bushes (in my garden), under the trampoline, trying to get under my sons car (which if he scratches it, my son will kill him, as it's his pride and joy), walking down the side of my house as if it's a public right of way and looking in through my windows. (We have a gate, which is kept shut, at front and back, which he just opens and walks in) I frequently have friends children here to play. AIBU to not want him to just wander in my garden, and if so, how do I go about stopping him. I've asked nicely, and pointed out that it's my garden and that it isn't public property.