Generally, there isn’t anything that would be “off limits” for a Will.  Usually, the more information regarding the testator’s intent, the better.  However, testators want to avoid inflammatory language, or comments that may cause a family member or friend to question whether there was undue influence by a third party or the testator’s mental capacity.  For example, if a testator wants to disinherit a child, he needs to state that, and perhaps give a reason.  But he certainly doesn’t want to say something like “because my son is a bum,” or “because my daughter says my son is a bum,” or “because the dog told me to do so.”