'My twin sister and I always wanted to marry twins. Then I got a message from a stranger.'

Growing up, identical twin sisters Nazanin and Nahid were always close. They were "like one soul in two bodies".

When the sisters connected with identical twin brothers, Hamed and Mahdi, they could never have predicted the journey that would unfold.

The love story began because the twin brothers were actively searching for twin sisters. After years of looking, they found Nazanin and Nahid through their Instagram page. What followed was months of getting to know each other online before the brothers made the ultimate gesture — travelling from Australia to Iran to propose.

Watch Nazanin, Nahid and Hamed and Mahdi's love story. Post continues after video.

Their first meeting was memorable for all the right reasons.

The brothers, who are originally from Iran as well, arrived on 6 December 2019. They brought bouquets of flowers and playfully introduced themselves as each other, leaving the sisters guessing who was Hamed and who was Mahdi.

The next day brought the formal proposal ceremony, where both families met. Everything "went very well and smoothly".

Within a month, they were married; Mahdi to Nahid and Hamed to Nazanin.

The two couples now live together in the same house in Australia, and both are currently pregnant with their first babies — two girls, due in mid-August within days of each other.

Their children will be quaternary twins, which are genetically close to being siblings.

Nazanin and Nahid told Mamamia they are overjoyed their children will grow up with their own "unique bond".

Nazanin and Nahid (29) are expecting their first babies, both daughters.

"They're technically cousins, (but) they'll grow up more like siblings, sharing so many life experiences together," Nahid said.

"I think it'll give them a deep connection from the start, and it's beautiful to know they'll always have someone so close in age and family; exactly like twins. It feels like a blessing."

Nazanzin said they tried to co-ordinate their pregnancies, but couldn't believe the moment when they found out they were both expecting.

Nazanzin's ultrasound (left) and Nahid's ultrasound (right). Image: Supplied.

"We planned to get pregnant together. A couple of weeks after missing our periods and feeling some cramps, we took home tests together. Seeing both positive was an emotional and happy moment," she said.

"It feels like a special blessing that our babies will grow up and support each other like sisters."

Mahdi said he and his brother have been talking to their babies, and hope their daughters can hear them.

"Genetically they are cousins and sisters," he said.

"We are so excited, we are very happy."

The twin thing.

The sister explained they had always wanted to marry twins; who else could understand their special bond?

"We often finish each other's sentences or say the same thing at the same time. Sometimes we even send each other the same clothes while shopping online without planning it. It's a deep connection and we're so thankful for it," Nazanin said.

Nahid described their bond as "unbreakable".

"Growing up as twins is truly special. We always had a built-in best friend — someone to play with, talk to, and share everything with," she said.

"We could read each other's minds or feel each other's emotions. We even feel more confident when we are next to each other."

The experience of growing up was similar for the brothers. As Mahid explained, the main reason they wanted to marry twins was because they "didn't want to get separated".

Nazanin explained they had been courted by twin boys "a couple times" but whether it was age or chemistry, the connection was never quite right. Then Hamed and Mahdid came along.

"It was meant to be and by God's plan, we met our husbands and got married very quickly — like a miracle," she said.

Living under one roof has not come without the occasional challenge.

"It has definitely been a learning experience," Nahid said. "One of the biggest benefits is sharing everyday moments — from meals to just relaxing together. Of course, it's not always easy. Adjusting to each other's routines and personal space can be challenging at times. We've had to learn how to compromise and be more patient."

They know their growing family isn't exactly conventional, but for them, it makes sense.

"I'd want people to know that while our family might seem quiet or private from the outside, there's a lot of love and support behind the scenes. Sometimes people overlook how close we really are, even if we don't always show it openly," Nazanin said.

You can watch more of their story on Australia's Most Identical, a two-part special that delves into the fascinating world of identical twins on 9Now.

Feature image: Supplied.