Identical twins Yang Kang and Yang Jian married identical twins Zhang Lanxiang and Jiang Juxiang.
At their joint wedding, the brothers sported different haircuts while the sisters wore different coloured dresses so people could tell them apart.
"We really can't distinguish who's who, so we ask them to name themselves before speaking," said Zhang Shengzhong, the father of the twin sisters.
And the grandmother of the twin brothers admitted: "If I can't tell the difference, I just answer them with a smile without speaking." [Link]