Check out nPose ... it's an open source set of scripts and objects. You put your animations into the object (a chair, say) then drop the nPose scripts into the same object, together with one notecard for each "scene" ... a scene might be a single animation (one person sitting) or a couple kissing, or 4 people having dinner, or whatever. One notecard per "scene", then nPose will help you adjust all the avatars to the right positions, then you update the notecard. It's really simple and fast.
And free ... did I mention free? And OpenSource. And there's an amazingly helpful nPose group to answer even the dumbest questions politely and quickly. Get nPose on Marketplace or in-world search for nPose.