The Roman Missal does not allow for the faithful to raise their hands in the “orans” position (or hold hands) during Mass. Such posture is reserved for the priest.
Article 6:
§ 2. … In eucharistic celebrations deacons and non-ordained members of the faithful may not pronounce prayers — e.g. especially the eucharistic prayer, with its concluding doxology — or any other parts of the liturgy reserved to the celebrant priest. Neither may deacons or non-ordained members of the faithful use gestures or actions which are proper to the same priest celebrant.”
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