Yeah. My nephew has some of my odd thinking patterns and this worries me. I don't want him to turn into me. I sometimes do my negative thinking with him. But, my sister nails me and points out the fact that the thought is wrong. She is a bit harsh with it. But, she just can't believe some of the odd beliefs that I can hold.
As for my mom and step-father, I worry that I will try to discipline kids like they did me. I do not have kids. My sister will sometimes say something mean to my nephew. But, she tries to let him know that she doesn't mean it. She just needs to vent. Her husband also tries to step in and help when he sees that she is gettting too frustrated to deal with my nephew. I worked in a daycare for a while. But, I never could figure out how to discipline the kids. I will have to take parenting classes before I can raise kids.
Suggestions: Work on your issues in therapy, self-help groups etc, be honest about your weaknesses. Also, be willing to get help early. A lot of mental illnesses can be prevented or atleast kept at a much lower severity if one gets help early on. Thats what I do. I think it saved me from a major/minor depressive episode.