The mother of a friend of mine is a fraternal twin (both females). A cousin of that friend's - the cousin's father is my friend's mother's brother - had fraternal twin boys a couple of years ago. I was once told it was a trait only females could pass on, but if it's somehow X-chromosome-linked, then my friend's uncle may have passed the gene(s) onto his daughter.
Some days I think having multiples would be good, because I could get all or most of my parenting (would like to have 2-3 kids) done with at the same time... and then most days I think it would drive me nuts so no, thanks.
Today they would be:
Arthur James &
William George
Charlotte Emilia &
Theresa Niamh
Charlotte Emilia &
Arthur William