Interesting question. My dad had a chair. In his case, yes to all the questions, except that it was free game when he was not using it. And we were alway free to sit in his lap in the chair.
For my husband, no, no, no. He just has a specific chair at the table, but we all have assigned seats, and he has no specific preference to his seat, we arranged them based on practicality, and move things around as needed.
DH's father had a chair. He was less attached to it than my dad.
All Christians.
Al