When I was growing up, my sister and I used to have to share bath water (we had a rather elderly immersion heater with no thermostat, so it couldn’t warm up enough water for us both to have clean water). As the eldest, I always went second, so I always got the cooler, somewhat grubby water, and once I was old enough, I also had to empty and clean the bath, and hang up the bath mat and towels, whilst my little sister got clean, hot bath water, and no chores afterwards.
I didn’t mind this too much, when her bed time was earlier than mine - the pay off for the dirty water and doing the tidying was staying up whilst she was in bed - but once I was 12 and she was 11, mum decided we should have the same bed time.
I decided this wasn’t fair, and asked mum if my sister and I could take it in turns to go first, so we’d both get a turn of having the hot, clean water and no tidying (we only had baths twice a week), but my mum refused point blank! She even took me to the bathroom and dibbled her hand in the water, telling me it wasn’t too dirty, and it was still warm enough.
She and dad used to share bath water too, and she always went first, so I suspect she didn’t want to set a precedent that it was unfair for one person to get the hot, clean water, and the other one to be stuck with the grubby water and the tidying. But dsis was definitely itelynher favourite, and I’m sure that was a part of it too.
When I was 18, my ‘special’ present (they said 18 was the Big birthday) was a clock radio costing £21. For her 18th, my sister got a new oboe, costing £250 - and I was not supposed to care about the discrepancy.
There is a good reason why I am happy to live at the other end of the country to my mum, and why I don’t feel much guilt over not making the effort to visit more often.