ADVICE NEEDED!

So a short back story before I get to the point of my post. In 2015, 2016 then 3-1-2019 I had to talk to my daughter about her Great Grandmother, Grandmother then Grandfather passing away She was 13 when her grandfather passed away. Fast forward to 5-30-2019 and my daughter passed away. Ive struggled for years with it, but was blessed with 2 more daughters. Jenuca is 2 and Jenesis is 1. Now we get to the point of my post. On May 10th 2023 my girls father passed away from a motorcycle accident. Ive tried mybest toexplain why daddy isnt here anymore but..... I'm struggling also to juggle everything along with losing my job and our world just falling apart. Jenesis has been lashing out and hitting, fighting, just a total 360 from the little girl she was. Jenica is being OVERBOARD defiant and always a look of sadness. They ARE NOT the same little girls they were. ANY ADVICE on ways to work with them, explaining, ANYTHING would be greatly appreciated!