I mentioned above we have 20 points gap in VIQ, we hav a 4y 8mth gap and its the younger who has the DYS IQ. Having your nearly 5 yrs younger sibling catching up across the board is pretty harsh. So far our eldest isn't too distressed, but it's also still "catching up fast" and mostly not yet "over taken". And yet in so many ways that gap is NOT obvious. Certainly we were not aware when they were younger. I guess partly because of the age gap making comparisons hazier, but also because the eldest is still MG. and neither of them are academically focused.