Question

What did that boy asked him and John?

is that a sentence

also how many syllables in grandmother

Answer 1

Yes. It's a sentence.

The syllables in grandmother:

grand moth er

Answer 2

okay

thanks

so it is 3 syllables in grandmother

Answer 3

Yes -- three syllables in grandmother.

Answer 4

In your first sentence, be sure to use "ask" with the helping verb "did" -- not "asked."