Legal Question in Wills and Trusts in Florida

Re: If one is named as beneficiary of a trust, do they have to raise the minor c

You probably mean that your sister is named as trustee of the trust for a minor child. This only pertains to the property of the child. If the child's parents die, there will be guardianship proceedings to determine who will be in charge of the person of the child apart from his or her property. It may or may not end up being your sister depending on several factors and it certainly does not have to be if she doesn't want the job.