in need 15 permanency for permanency six people one by one, and it cost 12500*15=187500
and it's WBL of 14th charicter in PF.
if you just want to telpath between you and them(not among them), you just need 37500gp (party, spouse, and clan)
much cheaper.
and it need 13th caster level for it and it looks like the spell you want to permanent and permanency have to cast by same person.
http://www.d20pfsrd.com/magic/all-spells/p/permanency
DESCRIPTION
This spell makes the duration of certain other spells permanent. You first cast the desired spell and then follow it with the permanency spell.