What happens when a twin dies and the other survives?

What happens when a twin dies and the other survives?

When my father suddenly passed away, one of the most affected is my aunt, his sister, since they were fraternal twins.

My mother, we children and my father's widow are slowly moving on, but my aunt has gotten extremely depressed, to the point we are afraid she might just die of heartbreak. We always have someone assistiting her, she's 64 but she looks like she suddenly aged of at least ten years.

Have you ever seen something like that happen?

What happens when a twin dies and the other survives?
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