Not telling child about their bio father

Using a throwaway for obvious reasons.This is a deep secret that I've struggled with and am unsure if I'm doing the right thing.I was married fairly young, had a child, and divorced the father a couple of years later. During the long, drawn out divorce I became involved with another man. I got pregnant and left 5 months into the pregnancy due to the severe physical, sexual, emotional, and mental abuse. First child was 2 when that happened. I eventually got back together with my ex-husband (3 months after the divorce, 2 months after baby was born). 2nd child's bio dad never wanted to be in the picture and he hasn't. We have been NC since I left 6 years ago. 2nd baby is spitting image of me (thankfully). When my husband takes her out in public, they always get complimented how much they look alike. Husband has fully accepted 2nd child as his own.I know all of her bio dad's family medical history and there's nothing concerning unless she were a male. First child does not have any memory whatsoever of the short, horrific time with 2nd child's bio dad. Hubby and I have agreed that that period of time never happened and family is on board.I have caught a lot of criticism for not wanting to tell our children that they're half siblings and for also not wanting to ever tell 2nd child about her bio dad, but after I explained what kind of human he was, they agreed with me. It took me years to stop watching over my shoulder and having nightmares. There was absolutely nothing good about that guy except for him giving me my second child.Am I wrong to not want to tell my kids? via /r/Parenting http://ift.tt/2DF9MiK