I think the fruits are too big for any Citrange, so I agree its probably a Citrumelo.
So, are there two separate trees there? - it's a little difficult to tell - one looks taller and the fruit have more green on the underside.
I have just received a photo of the first outdoor fruiting citrange/citrumelo I have ever heard of in the UK!
This is growing at the back of a house in Nottingham, England.
The owner thought it was a Citrange and has been growing it for 22years. But I contacted the retired nurseryman who supplied it and he
believes it may be originally from a Dunstan Citrumelo cutting he received from the US. Again, this seems likely to me,
as the fruits are big for a Citrange. Either way it is a great rarity here - I have been searching
for such a plant ever since I became interested in citrus over thirty years ago. I will be getting budwood in the spring.
Mike/Citrange