A gay couple has welcomed a set of twins with two different fathers, after both men were able to fertilise an embryo during the IVF process.
Calder and Alexandra Berney Edwards are actually half siblings despite being born at the same time, because they don't share paternity.
They were born to -based couple Simon and Graeme via surrogate, Meg Stone, 32, whom they met in .
Amazing advances in IVF meant that the couple were able to fertilise an embryo each and both were placed into surrogate Meg Stone's womb.
Simon, 43, said: 'It really is amazing that Graeme and I have been able to father one of our twins each.
'Meg did an amazing job - and it meant that she was actually pregnant by two men at the same time. It's thanks to the wonder of IVF that we have been able to achieve our dream.
'Graeme and I have always wanted to have a family, and now we have our lovely twins.
'They are still classed as twins even though they have different biological fathers.'
The couple knew that they wanted to try to start a family this way as it meant that they would be the named parents on the birth certificate from the start.
This is unlike the UK where it can take up to six months to get a parental order granted to change it from the named birth mother at the birth.
This treatment isn't practised in the UK, where two embryos fertilised by different fathers are put back at the same time.
So they extended their search for a surrogate to Canada and met Meg who already had a family of her own - her two sons, Jeffrey, 12, and Max, five.
Meg said: 'I saw Simon and Graeme's profile on a surrogacy website and I thought they had lovely smiles.
'I had recently split with my partner and I wasn't ready for another baby, so I wanted to help someone.'
The couple chose an anonymous egg donor, and then flew out to a fertility clinic in Los Angeles to fertilise the embryos.
Simon said: 'We couldn't decide on who would be the biological father. Graeme said it should be me, but I said that he had just as much right as I did.
'When we spoke to the doctor at the clinic he stunned us with his reply. He told us that it could be both of us.
'They said that we could have half the embryos fertilised with my sperm and then half with Graeme's sperm.'
The couple then tied the knot, and decided to fly out to Canada on their honeymoon - and meet up with Meg for the first time at the same time.
Simon said: 'We were nervous at the beginning - in case that we didn't click with her. But we needn't have worried.