If you are going to benefit from the Will, I would advise against having any hand in drawing it up. Whilst I am not suggesting that you have anything other than your parents' best interests at heart, should the will be challenged, the court will look at any circumstances that will "excite the suspicion of the court". Whilst you could quite happily draw up a Will which you or, say, your children could benefit from, it will be difficult to show that there were no suspicious circumstances in a document which you were instrumental in drawing up. Thus the best way to avoid any challenges whatsoever is to have a will professionally drawn. In my experience, the Wills that cause the biggest problems (in terms of validity or construction) are home made ones made by the use of will kits. If your parents are worried about the cost, you could try going through a charity free will scheme run by some of the major charities. Apart from anything else, if there is a **** up by the will draftsman and your parents have used a solicitor, the beneficiaries will be able to sue the solicitor through his professional indemnity insurers.