Yes, a minor child can be subpoenaed. The law provides for this.  A subpoena is issued in the name of the person required to appear, even if the person is a minor.  Additionally, a minor is subject to much the same rules as an adult witness (although this can varies from jurisdiction to jurisdiction, particularly the younger the child).Note:  Do not ignore a subpoena.  There can b e civil as well as criminal penalties for the child and/or the custodial parent or guardian.