Baby #2 on the way, but losing my Dad. ๐Ÿ’”

Julie โ€ข 28. Army Wife. 2nd time mom. Little Prince ๐Ÿ‘ถ๐Ÿป Emmett David born October 1, 2016. ๐Ÿ’™ Pregnant with a baby girl. Due 10/17/17 ๐Ÿ’œ
Our son is only 4 months old & we just found out on Valentine's Day that we are expecting baby # 2!! We are excited, nervous, happy, scared all at the same time.ย 
My father has AML Leukemia, & I am conflicted on whether to tell him or not. We have been through all of the treatments possible for him, including bone marrow transplant (I was only a 5/10 match, & his body rejected it, & doesn't want to be matched with a non relative donor.) He only has one chemo session left, & a slim to no chance of survival. His doctors gave him til hopefully the end of summer & my EDD is 10/21/17. ย I am so conflicted on wether to tell him or not. I don't want to break his heart with telling him the news & him have to live the rest of his days with sadness & anger that he won't be able to see or meet his 2nd grandchild. & on the other side, I don't want him to know I was keeping this secret from him & him be mad at me for not telling him...I'm so lost & already have an incredible amount of guilt. My father is my best friend. ๐Ÿ’”
Myself, my husband & the rest of my family already know the news & we are all very excited. I've always wanted to have my children close in age, & cant wait to meet our new bundle of joy!