I am having a final straw moment 

Is this just how toilet seats are? Or is everyone else inconsiderate?
My DC are small built but for some reason in every house we have ever lived in and every toilet they have somehow managed to break or skew the fixings of toilet seats. I have had to repair more toilet seats in my life than surely is normal
I have 2 toilets now that have fixings that you screw into the bowl and then you place the sweat on to 2 pegs. Whenever I go into the toilet and go to sit down, the toilet seat is loose. My mum does this to my toilet and my DC.