around 5 years old occupying the whole seat. The child came from economy. Cabin crew were well aware but let it go.
I am sorry, but as much as it should have been at least questioned by the CC, you needed to say something if it bothered you. I certainly would have asked what was going on.If the child came up from Y to sit with mum instead of say, dad, then perhaps mum and dad should have swapped places and the child remain in Y.