In simple words
The life line curves around the base of your thumb. Palmistry links it with energy and vitality. It does not show how long you will live.
How to recognise this one: A second fine line runs alongside your life line on the thumb side, like a parallel companion.
What it means
This is traditionally seen as a sign of extra resilience and support. People with a sister line often bounce back well from difficult periods and may have strong backing from family or friends.
Growth
Lean on the people and practices that support you. Strength is easier to keep when you share the load.
Palmistry is a tradition of reflection, not a medical or scientific reading. Lines change over a lifetime, and no line predicts illness or the length of a life.