A lady (not a client) contacted me with the following scenario. I am divorced and have physical custody of our two daughters, but share joint custody with my ex-husband. In the divorce papers it states that our daughters will be covered under my new husband's health insurance policy. However, my ex just got a job where he can add our girls to his policy without paying any extra, so they will have double coverage. Which will be the primary policy, their biological father's, or their step-father's? I made a few calls, but did not get anything definitive. Thought I would throw it out here. Here is my qualified response. Thanks for writing. I really wish you hadn't asked that. There are no easy, or quick answers. My first impression is to tell you to leave well enough alone and do not put the girls under your ex's plan. There are too many potential pitfalls. Without getting in to too many details, here are some scenarios. The court decree supercedes the policies and your husband's plan pays first. The carriers can also do battle, each claiming the other is primary and both refuse to budge. The carriers could follow the birthday rule, whereby the insured with the first birthday of the year is primary, the other is secondary. Your ex's plan could say the girls are not eligible to be covered since the court decree specifies who has liability. This can be especially touchy if they learn, after they have paid claims, that they were not legally liable. They can then demand restitution for premiums paid (by your ex's employer) less any claims paid on their behalf. From my perspective, the least damage is to keep them off your ex's plan and do not provide double coverage. This may not be the answer you want but this is the best I can do under the circumstances. take care, Bob I have probably run into this before, but my brain is fried. Is there a definitive answer to her question?