My divorced uncle passed away about 3 years ago. My cousins were all married, just to give you an age perspective. My aunt and uncle had been divorced perhaps 20 years. My uncle had not remarried.
Not only did my aunt help her children clean out my uncle's apartment, she was at the funeral. My aunt's parents were there, along with some of my aunt's siblings.
It was not awkward at all. My aunt is a wonderful person, and while my uncle and her got divorced - I still consider her to be an aunt.
I digress...my aunt was very supportive in this process to their children.
At a different funeral - when my BIL passed away, BIL had 2 children from a previous marriage. The EX stopped by, was very cordial, and spent a few minutes with her 2 sons. The EX seemed to be a little embarrassed being introduced as the first wife of my BIL. My SIL was not phased by the EX being there at all. SIL and BIL had been married about 25 years. I do not know what the details of the divorce where, although I do not believe that SIL and BIL met until after the divorce.