Fidelity Investment Account and whose taxes?

I had a fidelity custodial account set up for each of my children. I converted one of them to my son (age 27) in August of 2019. Not that they did a whole lot but do we file the 1099-div and 1099-int on his taxes (first time as not a dependent of mine). Or can I still file them on my taxes this year but not moving forward. The answer will help determine the other child and when to move them over.