Born sinister, voted ambidextrous; although when right-handed I do have a hook-grip. I write more with my right hand, but only 'cause the school I started at as a kid (private, religious) used to whack me with a ruler whenever I picked up a pencil with my left hand. Do most everything with whichever hand is more convenient (have used mouse on computer both left and right-handed) but often default to right, because that's what tools are made for (scissors spring instantly to mind - agh). It is of note that my handwriting, no matter how hard I try, always sucks; with either hand.
Mother was one of four, father was older of two. All three of my half-siblings are right handed, all my parents, grandparents, etc I know are right handed. I wonder if the milkman was a leftie...