From BBC News:
Family life is busy for Israr Hussain and his wife, Tasleem Akhtar, who have four daughters between the ages of five and 15.
They chose to have their wedding back home in Pakistan in 2007 and live in Birmingham.
The 47-year-olds are not only husband and wife, but also first cousins, as both of their fathers are brothers.
Marrying a first cousin is commonplace among Muslim families. It is about protecting wealth, land and property and helps keep the family together.
While marriage between first cousins is not illegal in the UK, medical experts say it can cause genetic diseases in the children they may bear.
Growing up, Mr Hussain and Ms Akhtar were told by their parents that one day they would be married, so when the time came, they never questioned it.
What they were not warned about was any potential health risks that could occur if they had children.
But even if they had known, Ms Akhtar said it would not have made a difference.
"That's God's will, nobody can say anything about that. Even if you marry outside the family, it could still happen," she said.
"So many people have married outside the families and they may still have a child with a disability."
The couple, who moved to the UK in 2004 and have been living in Birmingham since 2009, said all of their daughters were healthy and thriving.