It’s good that it’s improving. It’s strange if you stutter more with your family. Do you sense more pressure when speaking with them as opposed to just public speaking? (Could be pressure of not wanting to let them down, not in a sense that they pressure you). Most often people say it’s from stress, but the root cause could be very complex. I still can’t figure out mine completely as well 😁. But in any case you should not mind it too much. I have had 0 problems with my close friends, girlfriends or with anybody who genuinely cares about me.