Video link ideas?

My wedding is coming up at the end of August and unfortunately my elderly grandparents are unable to attend due to the distance and their health.

However they really want to be able to watch the ceremony, and I'm wondering if people have any suggestions of platforms to use to stream the ceremony for them? They have an older smart TV that has YouTube on, but no laptop/tablet. I considered YouTube live but I believe you have to have a certain number of subscribers to be able to stream live?

If anyone has any experience of this or any advice I'd really appreciate it!