They may have had a rocky start starting a family but now they might just be the most modern one out there.

Natalie Lovett and Fiona Fagan may not be related but their daughters are sisters.

Ms Lovett went to America to legally choose anonymous donor eggs and sperm and nine months later she gave birth to Lexie, a healthy baby girl.

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Natalie Lovett and Fiona Fagan may not be related but their children are siblings (pictured)

Ms Lovett (pictured) went to America to legally choose anonymous donor eggs and sperm and nine months later she gave birth to Lexie, a healthy baby girl

After a failed second IVF attempt, Ms Lovett donated the 24 eggs on the one condition all the siblings stay in touch

'I wanted it all, picket fence, children running around, it just didn't pan out for me that way unfortunately,' Ms Lovett told Today Tonight.

'It's a surreal process, you are on a database, you're putting in criteria, eye colouring, hair colouring.'

However, when Ms Lovett went on to have a second failed round of IVF, the Sydney mother decided to donate the 24 eggs as long as they all stayed in touch.

One of the mothers was Ms Fagan, widowed in her 20s then went through early menopause in her 30s desperately wanted a healthy baby.

The Adelaide woman successfully gave birth to baby Adeline and ten days later, Mia Bee gave birth to baby boy, Sam.

While Adeline and Sam are both 18-months-old and Lexie is three-years-old, the mothers joke that their three children are triplets.

'It's a surreal process, you are on a database, you're putting in criteria, eye colouring, hair colouring,' Ms Lovett said

One of the mothers was Ms Fagan (pictured), widowed in her 20s then went through early menopause in her 30s and desperately wanted a healthy baby

'I'm a single parent so I was only giving Lex one side of the family. We're an extended family and all go to each other's everything,' Ms Lovett said

'I'm a single parent so I was only giving Lex one side of the family. We're an extended family and all go to each other's everything,' Ms Lovett told News Corp.

'Three-and-a-half years ago there was none of this.'

Wanting to educate people on the different ways families can be made, Ms Lovett told the publication Australian laws made it 'virtually impossible' for eggs to be donated.

Because it is illegal to bring embryos to Australia, recipients have to spend about $5000 to travel to America to take part in IVF with egg and sperm donors.

Because it is illegal to bring embryos to Australia, recipients have to spend about $5000 to travel to America to take part in IVF with egg and sperm donors