Board Thread:Boruto Discussions/@comment-30965052-20170128171940/@comment-734582-20170610080039

In genealogy they don't use direct or indirect descendant for exactly this reason.

Hinata is a lineal descendant of Hamura. She is a collateral descendant of Hagoromo.

Lineal means that she's the daughter of a son/daughter of a son/daughter etc whereas collateral means she's a niece (IE the descendant of someone's brother)