Snow Estheim?

[Persephone Stephanie]

Yes but it´s out of context.
She is basically saying:
"Hey Snow,I couldn´t let you die because my mother´s heart would not enable that.That is what gave me strength"

This only mades sense if he is Hope´s big bro.

She also told him to protect Hope and smiles before falling.

Hope stinctively knows this and that´s also what makes him whine even if he isn´t conscious of this.Not just his mother´s death.

No, she is not basically saying that. She is reaffirming her previous comment that mothers are tough. She's proving her point to Snow, who if you didn't get it doubted her ability to fight. That's the context. It's not secret code for "hey, you're my secret lovechild!".