Is it normal that i despise my mother and wanting to plot revenge

So my mum walked out on me, my dad and 3 siblings nearly 3 years ago. Ages now 27,23,21,12. She doesn't want to have anything to do with us, but constantly ruins our lives. For example, before she left she slowly stole £18,000 of my dads money over a year or so, had several affairs, we owned two properties, one rented out to others... she emptied that acc also, which was to pay bills and mortgage. Therefore left my dads credit rating bad. In the divorce they agreed we'd have a house each, her in the big farm house, the rest of us in the big town house. But hadn't changed the mortgage over into seperate names yet... she has once again not paid the mortgage for 8 months, and my dads credit rate is bad again. We are now forced to sell our family home and move to somewhere smaller and in a low budget. She is much worse than this, this is just what is currently going on...

Let me tell you about the time I was transferring her £280 a month for my car insurance when she was the named main driver. Little did I know, she'd cancelled it, kept my money, and I was driving uninsured for 8 months. Putting so many lives at risk, wasn't till I got a court letter with threats that I found out.

That's just the begging. I want to plot revenge, and ideas? Or shall I just get on with my life, which is what my family and friends are saying. Help.