Should be able to add your spouse with a simple quit claim deed. Cannot add minor child to title, but if child is of legal age, you could also include him/her on the same quit claim deed. Probably will need a local real estate attorney to prepare (depending on state you live in), may be a fairly small fee to do so, and will need to get notarized and recorded with county recorders office for county you live in.
I agree with Ted that it is unwise to add the name of a minor child to a real estate deed, as the minor lacks capacity to transfer or encumber the property and a guardian would have to be appointed (to represent the child’s interests) if the property was sold while the minor child was in title. But if your child is over 18 (I.e., no longer a minor), then the same quitclaim deed procedure would apply to your child as your wife.
The children’s age makes all the difference, as I stated, if they’re under 18 they cannot legally own property in their name, but can certainly add them to title if they’re over 18. One consideration, if you do add them, and your wife to title, and you later wanted to refinance, everyone on title would have to consent to the refinance, same thing if you ever wanted to sell the home. There are numerous instances of heirs inheriting property from their parents with some wanting to sell while one wants to keep the home, can be a mess in situations like that.