Soon to be blending full time, spent most weekends and school hols together. All kids will be together 24/7. The step kids are sometimes badly behaved, swear, refuse to do jobs, fight. Not all the time. The dad does deal with it but it still happens again. My kids do not swear, fight or refuse to do jobs. Should i be concerned my kids will adopt this bad behaviour? They have seen it now for years and it hasn't so far, but we've not been in it full time. I'm hoping that my kids have already developed enough to know right from wrong