That makes no sense. Just as easy to sign up with multiple accounts under different email addresses. No bother to them, they don't need to check all the emails. It is however a pain for me, as I don't want to sign in to my kids' emails just to check BHA news, and they don't even use email.
Why not just read the emails the club sends to you then?
And, if you really feel the need, spend 30 seconds setting up a forwarding filter from your kids' email account to your own.