In my husband Ken’ experience, his dad died when he and his sister were already living independently. Ken’s mom remarried a widower 1 ½ years later and her new husband, Tom, had 3 independent children.
Tom moved in with Ken’s mom into her home, so his children lost their family home and they never felt her house was home. Holidays became very strained when all the adult children were together and they had to spend time with stepsiblings, practicing new traditions, when all they really wanted was to spend time with their biological family and follow long established family traditions. Eventually, Tom’s children quit coming for holidays and seldom came ‘home’.
When it came to assets, Ken’s mom and Tom were specific with items in their wills, but even so, when Tom died there was misunderstanding and bitterness about a few assets he had acquired after he married Ken’s mom.