Issi, my MIL sounds just like yours. I,too, do my 'duty' visiting, taking for her hospital appointments and having her round for sunday lunch. She has 4 sons and 1 daughter - I'm the only DIL that speaks to her - that in itself speaks volumes. I have a DIL, but unfortunately my Ys is getting divorced so we don't see her. I treated her just like my daughter and loved her too. My Es gets married in september so will have another DIL - who is lovely. My daughters fiance is absolutely brilliant and is just like a son to us. My own mum died 7 years ago but she never interfered unlike my MIL.
Anne xx