My mother.
Since, you asked for one person, it would be definitely my mother.
Mother gives up everything for you.
She feeds you before she eats herself. "What will you eat for lunch? Rajma Chaval?
Always asking, "Do you need money? You have the change, na?
Phones me twice or thrice when I am out.
Gives me the best advice. Anytime.
She gets tensed when I get sick. Who else would?