I just reply, if other people goes to that thread for information: for one reason or another, parenting a figure with another figure doesn't get any problem, EXCEPT, and it was my problem, if the inityial .obj comes from rhino3d; well , not always, but sometimes...
  here, it was possible to attach bones to the .obj, but impossible to link it to the hand; with a lightwave model, so initially constructed in poly, not nurbs (although of course, nurbs comes in poser once translated in poly), there are no problem, immediately... thank you everyone for your help!!!!!!!