CUSTODIAL 1099

I was curious if I need to file/report the 1099 or multiple 1099's (haven't received them yet but I will) for our kids custodial accounts even if they didn't earn more than $1,100 in unearned income and they don't have any other sort of income. If yes would I just attach it to my own return with form 8814 for simplicity or would I need to file it under their own tax return?

 

If I don't need to would I only have to worry about it once they make over that $1,100 threshold? Trying to figure everything out. My kids are young and won't be having any earned income for quite some time. 

 

Thank you