姻 means marriage bond and is a JLPT N1 kanji. It has 9 strokes and uses the woman radical (女).
Stroke order · 9 strokes
On'yomi (音読み)
イン
Kun'yomi (訓読み)
—
Radical
女 · woman
Strokes
9
How to remember 姻
A woman (女) in a new home (因) — the legal bond of marriage. 婚姻届 — the marriage registration form; submit it at the city office and you're a married couple!