Blood is thicker than water

How far can one go in sacrifices for loved ones? How to live for others without losing oneself? Or is selflessness meant to give without reservation? Each person answers these questions for themselves. 
For Ella, such a question was not even... on the table — she seemed to be born to serve her loved ones. But Emma, her sister, always believed that she owed nothing to anyone. She lived life to the fullest, never looking back, always knowing that Ella was there — selfless, loyal, submissive. Someone to rely on, who would always lend a shoulder.
And who is ultimately happy? The one who takes or the one who gives? The one who has memories, or the one who has seen nothing in life? Is a clear conscience and loyalty to family ties worth a life that, in essence, was never truly lived?