I am wondering how your cousin managed to get records on your grandmother from Bethesday Foundling Home in St. Louis?
Interestingly enough, my grandmother was born in 1911 (supposedly) and was adopted from Bethesda. We have never been able to obtain the records from Bethesda.
I can't imagine there is any connection with relatives because you are saying that your grandmothers half-sibling was not at the home, right?
If you could give advice on how to get the records that would be great!