For me it's my Grandma, or Joanie as she chose to be called by her grandchildren.
Gave up a promising career as a baker to marry my grandad and work on his farm with him. Raised four kids while working the farm. All of her children have turned into someone she is proud of what they would do for their family, close and extended.
She then brought me and my brother into her house when my parents split up, and looked after us. To this day I still say I am coming home when I ring her to say I am popping round.
She worked until just before her 70th birthday until her and my grandad couldn't afford to go on. On retirement, something they should have both really enjoyed together, my grandad slipped further into the clutches of Alzeimhers. To this day, she cares for him, and loves him even though he shows no emotion back, and doesn't appreciate the effort she puts into him. I go round some days and she is physically exhausted with the effort. But she still carries on, because of her love for him.
She has advised me at some of the lowest points of my life, and she is the first person I celebrate the best points with.