Dear Eric: My dad has been married to my stepmom for more than 25 years. From the start of their relationship, it was clear that she didn’t want to deal with two teen stepdaughters but tolerated us anyway. She can be fun and is considered the life of the party. There is clearly favoritism toward her two sons and it’s affecting the grandchildren. My sister and I are routinely put on the back burner and there is little effort for them to see us and our kids.