Some applicants may ramble on about themselves in a manner that may appear self-indulgent and not very appealing to the committee. Remember, this is an application essay, not an autobiography. Conversely, some applicants tend to say too little, perhaps hesitating to promote themselves too explicitly or not knowing what about themselves would be interesting to people whom they don't know. In such cases, perhaps focusing more on what you want to do than on what you have already done (let your record speak for itself) may help in getting beyond self-inhibition.
Adam and Brenda tell you that they want to do simple wills under which everything will pass to the survivor on the first death, until he or she dies or starts a new relationship. Whatever is left after that is to be used primarily to ensure that Charlotte has a roof over her head and adequate financial support while she is in full time education, but, subject to that, they want to ensure that all the children (and grandchildren if a child has predeceased) are treated fairly. They were going to draw the wills up themselves, and did some research on the internet which convinced them that mutual wills were the answer, but they sounded a bit complicated so they want you to draw them up and have made an appointment for that purpose.