Drug intervention for my grandson’s father?

My daughter will be having her baby in 3 months. And the father of the baby is a heavy drug addict. I have talked to his mother and told her that he needs to be apart of his child’s life. I told her I would help her pay for his stay at a rehab physicality. I think its a good idea but my husband does not. All because he doesn’t want the father to have anything to do with our daughter any more or the baby.

I told him that we need to do wat is best for the child. How do I get him to see that this is not about him and how negative he feels about the boy, that its about the baby? Any suggestions would be much appreciated, thanks.
I asked this in another section but no answers.

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