I asked my re the same question. He laughed and said yes. but since they are seperate eggs and sperm it would just be normal brother and sister or sister sister ect. He said they called fraternal twins cause they develope and mature at the same time. So techincally no right answer. :)
I think they would just be siblings. Interesting question!!!!
technically yes, but fraternal twins, so basically brother/sister, but created at the same time :)