noun
family photo
A photograph of one's family, often taken as a group portrait.
リビングに家族写真が飾ってある。
A family photo is displayed in the living room.
正月に家族写真を撮った。
We took a family photo on New Year's Day.
集合写真 is a group photo in general, not necessarily of a family.
Compound of 家族 (family) and 写真 (photograph).