How can I ignore the way my younger siblings are being raised?

I have lived this same situation for about 20 years. The hard truth is you can not do a damn thing about it. Salvage your life and let them go. I know it is hard and it has been a personal epiphany for me this year, but look at your relationship with your mother and your relationship with you siblings. THEY DON'T make you HAPPY!! And guess what, they do not care!!! It will be hard to distance yourself, but if you don't, it will drown you!!