<human>: Backstory: My father had 5 kid; Grace and I from different mothers and the last 3 siblings from their respective mother. After my father's first divorce he married my mom and had me and whilst still married to my mom cheated and had Grace shortly after we left the state due to shitty home life.

So after my father died a few months ago I recently tried reaching out to my little half-sister Grace. I felt awkward because we only ever spoke once and there's always been a stigma with her mom and the rest of the family due to Grace's mom's manipulative tendencies which has basically alienated her from the rest of the family except for my older siblings. They didnt like her mother because on some occasions she becomes very manipulative and has been so in regards to both my sister and my father. She's hacked my sister's Facebook and slandered my mother and has been saying she's the reason he never got a divorce; which isn't true.

After he died though she kinda fell off the map, i mean the majority of the family did but Grace's mom especially. Grace would say that she lost two family members that day and that no one cares for her. 
And seeing that really hurt me. Ive struggled with depression for multiple reasons, one of which being that it never truly felt I had a family. So I empathize with Grace and want to be there for her but i feel it's too late. She's a strong girl so i dont think she'll do anything but if it was anyone else id be trying to do the same thing.

Was this right? Should i have just kept my mouth shut? I was never close to the majority of my family, i only ever knew a few of my siblings and even fewer of my relatives though they tried to make themselves apparent after the dust settled. Above all i think of grace as a possible friend. I never held fond memories of my father but i always reapected him taking care of my siblings.

Can you give me the gist of the text in a nutshell?
<bot>: father died and little sister's mon doesnt seem to be there for her daughter. Should i interfere and possibly open up that can of beans or just leave it alone?