I am looking for my dad I don't have much on him but a name and a surname and I would like to know how to go about looking for him but here is the tricky part I don't know how to spell his surname and niether does my mom any suggestions?and apperently I have a sister but I don't know her name iether!anyone could help?

Without a surname it's going to be near impossible. Do you have a birth certificate? Know where you were born? Adopted?