This conversation goes badly when it feels like a verdict and well when it feels like a partnership. The difference is usually framing, timing, and who does most of the talking.
Pick the moment carefully
Not at a holiday table, not immediately after a fall, and not on the phone between meetings. A quiet weekday afternoon with no deadline attached gives the conversation room to breathe.
Lead with their goals
Try: "I want you to stay in charge of this decision, which is why I would rather talk about it now than after something happens." Then ask what would have to be true for a move to feel like a gain rather than a loss.
Separate the house from the decision
Fear of the house being sold out from under them shuts down many conversations. Make it explicit that exploring options is not the same as listing the home, and that they hold the pen on both.
Bring in a neutral third party
Parents often accept from an advisor what they resist from a child, not out of stubbornness but because it protects the relationship. A no cost planning conversation gives everyone facts to react to instead of opinions.