What’s the best way to keep a family together after loss of my dad?

My dad died in mid October and in the four months before, when he was ill, we all pulled together as a family. Now he’s gone, the glue that kept us together seems to have gone and each of us (my siblings and mum) seem to be getting lost in our own grief. Additionally, two days before his funeral one of my sisters decided she wanted a divorce, which has caused additional strain on all of us as it’s another loss and the circumstances around the divorce are complicated.
There just seems so much to deal with and I don’t have the energy to reach out to any of them, especially as I don’t live near by.