To ask if the word "sitting" has fallen out of use completely?

[LaPerduta]

See also "lying" and "standing".

I realise there are dialects and that this is Mumsnet, not an academic assignment, but I hardly ever see "sitting" being used when - dare I say it - it should be.

Do I need to move with the times?

I’ve seen people use abominations such as “a girl I went to school withs brother” and honestly, I don’t know how they can think it’s correct. It is actually awkward and ‘unwieldy’ to say