I am going to admit, I don’t know the answers to your questions. I can tell you a little of how my ex’s behavior has effects my young adults. First, he planned his moving out of the house day without telling my senior in high school. Yes, he’s insensitive and unaware of how his behavior effects others.Second, started dating less than 4 months after leaving the family home. He told the kids, and told them not to tell me!Third, brought her to the kids’ sporting events one month later. Yeah, less than 6 months after the divorce. (One year after HE knew we were getting divorced!)Next? Got engaged, again told the kids and told them not to tell me, less than a year after the divorce.Once again, planned the wedding date and never told the same son he blew off the year before.The kids? well I am very confident saying my two old children have no use for her. She offers them nothing. think they tolerate them as a couple because they love their dad. the younger one is pretty quiet so don’t know what he thinks. I know they are all polite and tolerant, because they were raised that way. she is, btw, their father’s wife. I KNOW she will never be their step mother.I support my kids. I am available, open, loving and encouraging. I stay out of their relationship with their dad as much as possible. They know where to come for love and support. that’s all that matterrs at this point. good luck!