How do you measure fairness?

So fairness is purely viewed around economic disparity?

I struggle with the fact that to purchase my home and achieve my income level, I ran a business from home and worked three part time jobs when my (3) children were young to get off the DPB. Then when I entered full time employment, I studied as a 1.5fte student for years to give them a better life. Every spare moment was spent studying. I then worked long days to prove myself.

So now that I have my own home and a six figure income, how is it fair that those that haven’t put in the same hard graft are gifted my hard earned money?