The best is to lovingly teach obediance from the crib on. If you wait until they are 2, it means trouble and greater conflict.
The worst is to treat each child alike. I have raised 5. Each is unique, and should be treated as such, within the family's overall guidelines. For example, a very gentle child may be corrected with a quiet word. A very strong willed child needs more. Treating them equally would be bad for both children. It is better to treat each child according to what he or she needs. The long term goals for the child are self-discipline, wisdom, and the ability to interact positively with others of any age or authority level.
The most dangerous is to allow a young child an equal say, as though he or she is a fellow adult. That child has no defense against unknown dangers.
Freeper Family Table is a Fridays-only thread, just for parents. Each week we discuss a different topic relating to conservative family life. If you want to be added to the ping list, let me know (and PLEASE indicate if you are a mom or dad!). Its a very low volume ping list but a worthwhile thread!