For sessions with young children, I usually recommend selecting one location and getting a variety of photos. With weather, logistics, and varying levels of moods, it usually the most comfortable way to go to get a bunch of great portraits. I estimate about two hours total, which is certainly flexible. Ideal lighting is early in the morning or later into the afternoon/evening, to get some of the golden light and low contrast tones. I have tips on wardrobe and output below the gallery.
Wardrobe: I always recommend dressing for comfort, warmth and how you naturally would. Simple neutrals tend to photograph better, but you really can't go wrong. Bringing extra outfits doesn’t hurt, and I certainly don’t mind carrying a small duffle bag around for y'all.
Output: I am confident in producing 4-5 very solid unique portraits of the whole family, and a handful of others. It’s very often 10 portraits with a handful of candids mixed in, but I aim to set expectations. All photos willll be optimized for digital use, and another set optimized for print. Y'all will have printing rights and I am glad to consult for albums, layouts, etc.