I saw a client who would like a Will with gifts given pursuant to the terms of a discretionary testamentary trust, which enables income and capital to be distributed to not only the primary beneficiaries, who are her children, but also their family and companies and related trusts.
For some very good reasons, the trusts need to be special Britney-Spears-type trusts, such that the primary beneficiaries do not get control of the trust unless the executors decide, in their discretion, that they are capable of managing their trust on their own.