Certain parental sacrifices can go beyond mere 'job description'. There's things like putting off prior engagements to go to a piano recital which, yeah... that's sort of the job description; but then there's literally putting one's life on hold for your children. My mum, for example, stopped working completely for five years to look after my brother and I. She didn't have to do it, by any means, but she did. And to this day I'm ridiculously grateful for that sacrifice, as it was pretty much entirely for our benefit.