I just lost a piece of my heart :(?

I lost someone in my family a while ago (his name is Shane K. Plamer) :( My sister has twin babies (boy and girl) and their father just recently got shot 3 times in the chest and sadly died a the scene :.( my sister has been taking this really bad :.( and so has the babies :.( The babies were just about 2 years old when they unfairly lost their dad and now they r just about 4 and they keep asking about him :( its very sad and the little boy always says that his daddy's gonna come and read him a bed-time story like he use to every night :( this is all just very sad! How r we sapose to handle this? Does anyone have any advice??? Im just soooo heart broken!!!!!!!!!!!!!! I feel like i've lost a piece of my heart that i cant seem 2 fill :( PLEASE PLEASE PLEASE if u have any advice please respond back!!! Thank you!! P.S. watch this video on youtube that Shanes little sister posted: R.I.P Shane K. Palmer - I'll Be Missin' You ( its very cute but also soooo sad!!!!)