Hi and welcome onmyownrecovery
There's some great advice here.
I've known people who did recover in secret, using things like SR, so it's possible.
Unless there's a history between you and your inlaws tho I don't think anyone would accuse you of being an unfit mother
In my experience families tend to be more willing to downplay the problem, rather than 'make it a thing'.
If thats what's stopping you from going public and using meeting based groups like AA or whatever, you might want to reconsider that
D