a single parent.
Honestly, if something happened to you, do you think your DH/SO could handle the demands of single parenthood?
I believe my DH could handle it. It would take him some time to adjust, and he would probably need help from family (but then, if something happened to him I would need some help too), but he could handle it.
I wouldn't have had children with him if I didn't think he could handle the full responsibility of raising a family should something happen to me.