To video or not to video
How long will the editing process take before we see the final product? You should discuss your expectations of when you want the film delivered. Some films could take three months and others could take up to a year.
Do you use licensed music? If the company does not, that could result in large fees and ultimately could put them out of business before you get your product. It also would make it hard to share your film on any website.
How will the final product be delivered, and will you supply a web-based video along with the DVD? Some professionals may offer to put the film on YouTube or Vimeo for you to share on your social media sites or via email.
Although I believe that any level of videography (even with iPhones) is better than none, I feel that having a professional filmmaker tell your story through motion, sound and music will result in a bigger emotional impact, both for you and for your future generations.