Husbands in this generation don’t always have a good feel for the subtle nuances that impact a DIL’s relationship with her MIL and SIL.
In fact, guys are usually quite oblivious to the consequences since the majority of them don’t place much importance on things like “sentimental value”. And note that I said majority, not all.
Your intention to bring the subject up with your in-laws is a great one. Do it with great care, if you must.