Re: do you tell your spouse everything that happens in your own family..
Yup, that’s that.
Your MAIN concern or fear was that your husband was hiding things from you. Now, you can put that suspicion to rest…as you’ve learned that this wasn’t the case. Don’t let the sister’s behavior or doubts about her “having said something”…get under your skin now. The person you have more of a relationship with is your husband. If your sister doesn’t feel 100% comfortable in sharing with you…so be it. She’s not obligated to. With her immediate family, it’s different. And it’s not like you’ll never know about her rishta in the event it is finalized.
If it is…wish her well…look forward to dressing up and celebrating. Don’t let the little things like who shared and who is hiding things…and who gave what gift and who didn’t…get to you. Let some things slide and look at the bigger picture. If for the most part…the overall relationship with in-laws is civil…then it’s better to let the small things go (as you can’t change the person). Seems you feel better…good that things turned out okay 