Some ideas: 1. Install the app when you visit, go to the process together (difficult these days, I know...) 2. If you have many iPhone users in your family, a

Some ideas: 1. Install the app when you visit, go to the process together (difficult these days, I know...) 2. If you have many iPhone users in your family, answer on iMessage whenever they send you a WhatsApp. This way you can pull them over slowly 3. If Android users send you a WhatsApp, check if they have Signal installed and answer there instead. It is "Salami tactics", but works for me.