Acts 1:14 These all continued with one accord in prayer and supplication, with the women, and Mary the mother of Jesus, and with his brethren.

When you are present at family prayer, give diligent attention and notice what confessions of sins are made, what petitions are sent up, and what praises are returned to God for mercies received.
The devil will do his utmost that you may be absent at prayer; absent in mind, when present in the body. God is not pleased with the prostrating of the body, when your hearts are not in the work. Do not so dissemble on your knees with God and man. Are you really desiring the mercies you pray for, whether pardon of sin, an interest in Christ, and evidences thereof, when your minds and thoughts are wandering about other things? If that is the case, let conscience remind you of the work you are about. For is this not to sin against God, when you pretend to be serving him? And are you provoking him, when you should be praying to him, to be reconciled to you, and turn his anger away from you?
Joint prayer should be made with one mouth and with one mind: “These all continued with one accord in prayer,” which word is translated, in Romans 15:6, with one mind. “That ye may be with one mind and one mouth glorify God.” But when your thoughts are wandering in family prayer, though there is but “one mouth,” there are many minds. These persons do not accord in prayer, when there is great discord before God.
–Thomas Doolittle “Puritan sermons, vol2. p. 243