I am so sorry for your loss. That is so terrible. As far as Marley goes, it will take months and I do mean months for the poor dog to settle in with you and to heal. Be patient, be kind and just love the poor thing. I took in a 9 year old Yorkie at the beginning of the year and it took him at least a month to play with me. He is very much bonded with me now so just be patient and it will happen.
Those poor children to have to lose their mother. I am so happy they have you to see them through this. I hope they will get to see their siblings regularly as it is sad they are separated, but sometimes things are just how they are. I think having the kids there will help the dog, but it will still take time. Hold those children close and let them know their mom loved them dearly.
Good luck and I am very sorry about your daughter's death. It is so sad.
__________________  It's raining Yorkies here! LOL Teek  ,Rowan  , Raksha (Grand Puppy)  , Raelyn |