I just had to swipe this from Fr Z,
one of my favorite irritants at Mass
c. Special note should also be made concerning the gesture for the Our Father. Only the priest is given the instruction to “extend” his hands. Neither the deacon nor the lay faithful are instructed to do this. No gesture is prescribed for the lay faithful in the Roman Missal; nor the General Instruction of the Roman Missal, therefore the extending or holding of hands by the faithful should not be performed.
read it all,
Say Amen brother,