Can my mother be my domestic partner?

My company allows me to insure a domestic partner. If I'm single and my mother lives with me, can she be considered a domestic partner? Can I put her on my insurance?
What about other realatives, i.e. sisters, brothers, cousins, ect?

Get the definition of domestic partner from your HR department. There are many possible definitions and it can vary from organization to organization.

I'm used to using 'unrelated, same generation, sharing expenses' as a definition.

I would research the definition of the term but I don't think I'm going out on a limb when I say no. That is unless there is a relationship that you have not shared which I won't and care not to ponder upon but I don't read that from the context of your question. A domestic partner is expected to be someone with whom you would be married to if in fact you could. That is how I read it.

That would be incest and illegal

If you did declare her your domestic partner, well, that's incest, then you both could be arrested. Ditto on relatives closer than second cousins, in most states.

"Domestic partner" is generally used for same-sex couples in states that don't allow marriage or civil union. It can also be used for common law marriage of traditional couples. It's NOT a way to add family members to your health insurance.

thanks for the giggles.
Not in any country i know about.
sorry

No. Blood relatives cannot be your domestic partner for insurance purposes.

Every domestic partner certification form I've seen requires you to confirm that you are not related by blood to the person you are declaring. (Additionally, there are other things you need to prove also...but your mom would be ruled out by being a relative alone.)

Your domestic partner would be viewed like a spouse, which your mother would not legally qualify in any state that I am aware of. Generally, other your spouse, children, stepchildren, adopted children, and legal dependents are eligible for coverage.

If you could show that your Mom was dependent on you for support, you might could list her as a "dependent."

Check with your health insurance carrier.