I'll start by consulting elderly relatives.
Actually, President Obama is a distant relative of Koichi.
He’s a really isolated guy who cut off all contact with his relatives.
These people are kind of like a type of parents. Not quite parents, but kind of, in a pinch anyways. These are your relatives.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.