Yes Congrats. From experience, it is in many ways better than your own kids.
My oldest granddaughter is 2 1/2. A lot of fun.
Start planning though...They grow faster than your own since we seem always busy.
I already have the PW50 with mods waiting for her.
She has a Strider bicycle.
Wanted to buy / build her MTB for xmas but Grandma said hold off.
Loves model trains. And has no concerns about hanging out in the garage or under the truck helping or working on the KTM, our tandem MTB or road bike or even her Burley trailer. Plus she enjoys riding the Wednesday road ride pulled along in her trailer at 20 plus mph in a paceline. Helps with yard work too.
All this and I get to give her back to mom and dad when I'm done.