佳偶天成：
an ideal couple

百年琴瑟：
married couple for a hundred years

百年偕老：
(of a married couple) to stick to each other for a hundred years

花好月圆：
the flowers are in full bloom, and the moon is full---ideal time for wedding

福禄鸳鸯：
a happy wealthy couple

美满良缘：
a happy and wonderful marriage

夫唱妇随：
the man sings, the wife follows --- domestic harmony

珠联璧合：
an excellent match

凤凰于飞：
a couple of phoenixes on the wing---happy marriage

美满家庭：
a happy family

琴瑟和鸣：
marital harmony; happy married life

相敬如宾：
(of a married couple) to respect each other as if the other were a guest

同德同心：
to be of one mind

宜室宜家：
to make a harmonious and orderly home breath

白头偕老：
(of a married couple) to stick to each other till the hair turns gray

情投意合：
to be congenial; to agree in taste and temperament

花开并蒂：
a good marriage

美满良缘：
A happy and wonderful marriage

鸾凤和鸣：
Luan and Phoenix Sing together---Harmony in marriage 

小Car笔记：
domestic harmony：家庭和谐
home breath：家的气息
agree in：在 ... 一致(关于 ... 意见一致)