B and C are an unmarried couple in a long-term romantic relationship. B buys a house and C moves in with him. B has an attorney draft a revocable trust naming B as trustee and the lawyer as successor trustee. The trust creates a life estate in the house to the benefit of C, with the remainder of the trust going to E and F, B's children from a prior marriage. The trust instrument may be amended or revoked "by a duly executed document delivered to Trustee." B executed the trust and also executed a will leaving all of the property in the trust to the trustee. None of this property is presently in the trust.

B decided some years later to leave the house to C outright and asked the attorney to change the trust. The attorney prepared a new page for the trust instrument that changed the life interest to C into an outright gift, substituted the page in the trust, and stored it in his (the attorney's) office. B has a copy of the new page.

B added C's name to a bank account as a joint tenant with right of survivorship.

Three years later, B died. E and F challenge the alleged outright gift of the house; they also argue that C is not entitled to the bank account because it is a convenience account.

Discuss whether the trust agreement is enforceable and whether the bank account was held in joint tenancy with right of survivorship.