two x two

i was travelling on the ghan train one time,, i was in the lounge,having a few quiet drinks,and a pair of twin girls walked in.after a while i started talking to one of them.they both looked the same,very hard to tell any difference between them, well when they closed the lounge,one of the twins came back to my room with me, we made love,,in a while she left my room,not long after that she came back to my room,we made love again,we swapped phone numbers. for the rest of the trip,i only seen the girls to talk to,,10months down the track,both the twin girls,gave birth to my children,yeh,they both had twins,now i dont know weather my children are brothers and sisters or cousins