I have a SpLD - it's been variously diagnosed as dyslexia or dyspraxia or a bit of both, but it's along those lines.
I'm lucky in that I've had a diagnosis of some sort since I was 13, and have had it renewed in adulthood so I could get disabled students' allowance. But virtually my whole family has versions of it, so my mum was really on the ball about it.
I can't manage numbers well and some fine motor skills - my three year old is already much better than me and I'll get her to do things for me occasionally. But I'm really used to doing things my own way.
Actually, what I wish I'd known most was how to recognise the symptoms in my mum. Ironically, she's the one who pushed for diagnoses for us children, but she's never been diagnosed and she is so dyspraxic! So many things she just can't do, and I grew up assuming they were normal. Now I have a small child I really notice. So for example, I thought it was inevitable if you made a cake, you'd get flour and butter everywhere, and you'd struggle to get it in the tin neatly, and then you'd spill things everywhere. But on the plus side she is super patient with my toddler, because it just doesn't phase her that DD will spill the flour or whatever.
I also notice things she just leaves undone automatically, like she can't unlock an unfamiliar door or a latch, and if you do it for her, she can't close it again. She seems more bothered by this as she ages, so I am slightly apprehensive about what it'll be like with a more elderly parent who's dyspraxic - I suspect her coping strategies will gradually go, sadly.