Brorbror.. your brother's brother?

My other brother Darryl

Brorbror and brorbrorbror could be any of the brothers, including yourself.

The same is true in Norwegian, but then they go and ruin it all with "oldemor" = "great grandmother", instead of persisting with e.g. "mormormor".

At least in danish, we have “bedstemor” which behaves likes “oldemor” in being the mother or fathers mom so it’s really that form that is consistent with the system and not the parent-specific forms.

In the midnight hour, she cried ....

Nice.

The mother of the oldemor is called tipoldemor, and after that you just add as many tips as you need (in Danish but probably also in Norwegian).

We use the same in Danish, but also uses:

Faster = fathers sister

Moster = mothers sister

You can also use tante (aunt) about these

A farbror or morbror is often called an onkel (uncle).

That's still in Swedish, covered by the ...