My parents are married but dad was previously married and has 3 children (1 deceased and 2 living). My parents do not want previous children to receive any inheritance do they need a will or can they get by with a living trust? and IF they need a will can it go without being probated?
While they could use either a Will or a Revocable Living Trust, either a Will or any estate which was not in the Trust when they died would need to be probated. A Texas probate may be cheaper and faster than you imagine.