I have teen step children. Teen girls live in their own worlds. I wonder if Dad's situation might seem unfathomable to them. Perhaps, truly, they can't "feel" anything much, it's not touching them, they are a bit detached, and being self centred. They understand what they understand. ..and this is outside of their knowing.
Now, we know many illnesses are fixed. Some cancers are fully treatable.
Cheers to your hubby's treatment and i wish him well.
i
I have a step parenting story which is relevant to your post. But I don't want to upset you, I just hope it helps you understand your teen step children.
My teen lot suffered really badly at a funeral (sorry to talk death when you are worried about hubster), and they shocked themselves silly with emotion they felt at the funeral, which they hadn't felt when they heard about a family member's cancer.
They knew the one in the family had cancer. The teens carried on as normal even when after knowing the treatment wasn't working well, and when dad and I were beside ourselves with worry. It didnt touch them. After some fraught time I had to break the news about the death.
Whilst announcing, one teen continued (slightly) texting (or started to pass on attention seeking news to friends?) as I informed them of the sad news, and another wouldn't look at me fully, wouldn't turn round and was facing the texter and hovering over returning to the computer.
It was a whole another story at the funeral. Seeing others so desperately sad at the funeral, it was like they woke up. They realised what a tragedy it was! The eulogies talked about suffering and loss, the early departure of the relative, the missing out on life, and how loved he departed was. It was so moving. The teenage children sobbed and sobbed and shook and struggled. It became real.
It was an education in some ways. Two were older than your two and they still weren't in any way cognisant of what it all meant until they had to face it.
I am sure your DSD'S are worried, but maybe it's unreal to them, so they park it and worry about their own lives.
You could try imagining how you'd handle this if your own child was a teenager. Or if they were your sister's children. Why not have a bonding chat? Don't offer them support exactly. Appeal to their maturity. Tell them you love dad, all three of you do, and how real the fright has been, and how precious they are to him and you. A cancer diagnosis makes everyone consider what can happen, and during hard times like this, please can we go that extra supportive mile for dad? Now is the best time to show him how loved he is.
Would they listen to you? It's a whole heap of change for them having heard you're having a baby. The teens need handling with kid gloves right now.