Welcome, NY23brown!
Like you, I've never been a jw. My former SIL is, and over the years has made many attempts to convert me. More importantly, her religion was the major factor in wrecking their marriage, although both tried their hardest to stay together for the children.
The trouble is that compromise with jws is never an option. They have the "truth" ( ) and we worldlies do not. And they are trained to put compliance with their elders well ahead of family ties.
Is your husband completely certain that it is not "the truth"? If he has the least uncertainty, you'll be recommended excellent books here, including those of Ray Franz. I'll just recommend that you both thoroughly check out jwfacts.
You can best protect your family by limiting involvement with your in-laws, and ensuring that your husband is not vulnerable to the attempts to get him back in.
And very well done for standing up for your child!
Keep reading and posting, Retro