Having dairy goats for household milk consumption is great! Get full size dairy goats, Don't rush down to the local auction, do your homework and buy good standard size milk production does. You want does that will give a gallon per day - that will be minimum 4 lb. per milking am and same again in pm. Check milking productions records if possible. Milk production is determined by weight. High fat content weighs less but that varies during the miking cycle so you can figure that later weights will be heavier for same amount of milk. In your location there are a lot of 4-H kids with dairy goat projects. These kids grow up, graduate from 4-H, and sell out their goats. Some kids start with less than perfect show goats and as they improve their herds will sell these perfectly good milk production does in order to retain their offspring. (Some silly parents put a limit on the number of goats their children can have!) My favorite for household milk is Nubian, high in butterfat and volume. Second favorite are LaManchas, but you have to get used to the gopher ears.
Milk is not free, you need to figure the cost of hay, year-round, and grain during lactation. Grain is fed 1 lb. grain for every 1 lb. milk produced. In addition to feed you will have an investment in equipment. Milking equipment is normally stainless steel. At minimum you will need udder wash, teat dip, a milk bucket, strainer, strainer discs (you can substitute large coffee filters), storage containers (glass jars keep the best taste), and a mastitis test kit. And while you can tie the goat to a fence and crouch on the ground milking into a Cool Whip container, it is much more pleasant to have a stanchion and dedicated milking area. Preferably lighted for those early morning or late evening milkings.
You also need to remember the time spend feeding, watering, milking, washing and sanitizing udders and milk equipment. Since you will be producing new munchkin's milk yourself, and be time challenged for about a year, you might want to wait until second munchkin is older to obtain dairy goats.
Cheesemaking will require even more equipment, lots more work, and very large quantities of milk. With 2 children, you will need 4 lactating does to provide household milk, and enough milk for cheese production.
Not trying to discourage you from keeping dairy goats (our family favorite animal). Just trying to save you from yourself for a year or two! Then I will be cheering you on!
BTW, goats are closely related to deer so you may not have to worry about feeding them - you have a great garden and fruit trees . . . .
My balance. 
You buy milk.
