I think you'd want this:
Command : /cancel_spellcast
Command: /target_allow_pet_member_toggle 0
Command : /target_group_member 0
Spell : heal 1
Spell : heal 2
Command: /target_previous
Command: /target_allow_pet_member_toggle 1
Toggling off pet targeting wouldn't do so good when you toggle it off *after* you've targeted, no gm9?