Grow into adults

This is natural:

I hope I'll be around to see my grandchildren grow up.

Hmm, both work. It depends on the exact meaning that you want.

"I hope I'll be around to see my grandchildren grow into adults." makes adulthood sound like a gradual process. A role that they get to grow into.

"I hope I'll be around to see my grandchildren grow to be adults." makes becoming an adult sound like a singular thing. Depending on context, this phrasing could give a nic

Hello Alphecca,

if you had to add to the sentence would it be grow to be adults or grow to become adults or into ?

thank you very much

Anonymousif you had to add to the sentence would it be grow to be adults or grow to become adults or into ?

"Grow up" is all you need to say.
"Grow into adulthood" is more formal.