I love that idea! Tshirt ideas are always a good way because it can be hilarious at their reaction. Our son wore a shirt that said "oops, they did it again! Another me is coming November 11." It took my inlaws about an hour
I hope that didn't sound too downer. I've seen cute videos of grandmas-to-be jumping up and down and screaming with happiness over the news when the news was simply said to them, not done with t-shirts and stuff. Some of the cutesy ways that people use to reveal the news are a bit over the top, but if your family likes the clever tee shirt, the literal bun in the real oven, the pregnancy test wrapped up in gift wrap, etc. then go for it.
Does the family love that kind of thing? If not, just tell them.
Thats a really cute idea or u can wear that skeleton maternity shirt that has the skeleton baby on your belly!