My mother in-law is jealous that my sister in-law get along!

So first my husband says to me a few weeks ago that I hog his sister when we all hang out. I never ment to "hog" her we just get along . Then my over controlling mother in-law. Texts my husband saying "I guess in not a big deal they won't be around . If they were the would ignore us anyway." I never ment to hurt anyone. I just get along well with his younger sister. And his mom always has to put his sister down . Idk maybe it's me I just don't understand why they is so jealous. His mom always has the need to control every situation. Even at our wedding she refused to use the central pieces I bought. She went out and bought new ones and changed them on me the day before the wedding. Yes I have some resentment for her. But I honestly just love his sister like my own. We are sisters and get along very well. Help I don't want to upset anyone any more!