Got 1099-DIV (<$1000) for UTMA acct for grandchild, in child's SSN. Not my dependent. Do I or child's parent need to include 1099 on return? Child has no other income.

I know at some point it becomes taxable, and assume parent has to file for child or include on their return then.  My question is  does anyone have to report it now if it's less than $1100 ?