My parents keep inviting my brother’s ex because they say divorce does not erase family

My brother and his ex-wife divorced eighteen months ago. There was no public scandal. They were unhappy, tried counseling and eventually separated. They share custody of two children and communicate politely about schedules.

My parents adored his ex. She lived near them, helped my mother after surgery and spent twelve years at every holiday table. When the divorce happened, Mum told her, ‘You will always be our daughter.’ At the time it sounded loving. It has become a logistical threat.

My parents still invite her to birthdays, Sunday dinners and extended-family cookouts, even when the children are with my brother. They do not ask him first. They say their relationship with her is independent now and adults should not make family choose sides.

My brother has attended two events with her present. He was civil, left early and then stopped coming if he knew she would be there. My parents describe that as his choice. Technically it is. It is also predictable.

The next conflict is my father’s seventieth birthday. My mother invited the ex and her new partner. My brother says he will celebrate Dad separately. Mum is devastated and wants me to persuade him to come. She says the divorce has already taken one person from the family and she refuses to let it take more.

I asked whether she would alternate some events or see the ex privately. She said hiding the relationship would be cruel and would teach the grandchildren that people are disposable. I said nobody is asking her to erase twelve years. We are asking her to recognize that inviting a former spouse and a new partner changes the room for the person who grew up in it.

The ex has not demanded invitations. She says she is grateful and will follow my parents’ lead. That sounds considerate, but it also leaves my parents feeling morally confirmed.

I care about her too. I do not want her banished. I also think ‘no one should make us choose’ has become a way of making my brother absorb every choice.

What is a fair family shape after divorce when the in-law relationship was genuine? Can my parents keep her without requiring my brother to share all the same spaces, or does inclusion inevitably create a new exclusion somewhere else?