1. You ask your husband to choose between you and his kids
2. You don’t know much about your stepkids
3. You ask your husband to take you out to dinner on his child’s birthday, and tell him to celebrate the kid’s birthday on another day.
4. You don’t recognize the step kid’s birthdays or any other special events in their lives.
5. You treat your kids better than his kids
6. You interrupt your husband when he’s on the phone with his kids
7. You let his kids figure out on their own, where to sleep, and put their stuff, when they visit their Dad.
8. You have different house rules for your kids then for his kids.
9. You don’t let your step kids bring friends into your house.
10. You don’t let your step children spend any time alone with their Dad when they come to visit.
According to Examiner.com