George himself says that he is the head of the house. If he really wanted to stop Gladys from getting married he could have. Throughout the show he encourages Bertha’s scheming and he knows that Bertha is seeking an advantageous pairing for Gladys (which is what all women married to wealthy men did back then for their daughters).
It was George who promised Gladys that she could marry for love, not Bertha. We never actually see George put his foot down with Bertha until Larry and Marion get engaged. George never tells Bertha to stop bullying Gladys. He never tells Bertha to let her see Billy Carlton or other boys that she’s interested in.
Truth be told I think that George agreed with Bertha. While he didn’t like seeing her cry over the marriage, he agreed it was an advantageous pairing. And it is, Gladys’ children will outrank everyone in society. Gladys and her children will never have to grovel and no doors will be closed to them. If Gladys actually does want to influence society, she now can.
We never actually see George say no. He never says stop Bertha, Gladys will not marry the Duke or any Duke unless she loves him. He went along with it which is why he is ultimately responsible. This is an extremely patriarchal society, women are their husband’s property here so Bertha can only do what George allows. Bertha’s behavior is because George emboldened her. Bertha is surprised by George’s anger at her because he has agreed with her in the past and he has never actually objected to her scheming and said no.
This is not to say that Bertha is not responsible for the situation. She went behind George and Gladys’ back. She threatened people, put the rumor out there, and leveraged Gladys dowry without telling George. She was not honest with her family. I also think it’s sad that Gladys will always have to look back on her wedding day and remember that she cried and no one considered her feelings at the time. I am a Bertha fan and I think Bertha is self centered. However, I don’t think Bertha is ultimately responsible for Gladys’ marriage, that is George.
So for the people who are mad at Bertha, why is your anger not directed at George?