formal type portrait photos

[tsuki_no_bara]

can anyone recommend a place to get a formalish type portrait? for my dad's birthday, he wants nice photos of me and my sister, separately or together, and i have no idea where to go. when i was a wee thing we'd go to olan mills (i think it was in sears) for family portraits, but i don't know what the modern equivalent is. but that's what i need. we're mobile so the place doesn't have to be t-accessible.