You tell me:
"I expected to see the restaurant as it was last time, but I found, that a lot had changed -  a new feeling about it all, new waitresses, new people around and new decor. I realized that I too had changed since last. Time passes and change happens even faster; it feels like soft, round patterns - down and up, out and in, back and forth.
I also expected the family to be unchanging."

Look, families are created every moment. Family is not a constant, but perhaps a concept. You are born, you live and are in fact related to everyone.
There is a first time for everything you experience in life, and much is the same for everyone. Everything changes around this same, call it the stillness. It is in the stillness that the answers are - in yourself. When you receive a message from this place, reason and will almost feel like a sense.

You note:
"In a way, it's safe to know that the only thing that's certain is that everything changes."

Yes, insecurity and perhaps fear disappear, only love is always here, and when you don't hold on to a certain state, you become strong in observation, pure in awareness and open in sensing.