I managed to get most of my family to use telegram. I just stopped using whatsapp and convinced a few of them to do so also, the rest came because they couldn't speak to us otherwise.
The key was being stubborn and banking on them eventually wanting to talk to me.
> The key was being stubborn and banking on them eventually wanting to talk to me.
This. Same for me. I just put a message like this in the family whatsapp groups and then deleted the app/account: 'Hey everyone, I'm not going to be on WhatsApp anymore - you can call, text, signal, telegram or email me. Talk to you later!'. It was that simple. It took a little while but now my family is on Telegram. I know they still use WhatsApp but it's honestly not my problem or issue that they use the app - I just don't want to.
The key was being stubborn and banking on them eventually wanting to talk to me.