Does A 14 Year Old Child Have To File A Federal Income Tax Return If Earning Passive Income From A Umta?

Absolutely.
The income is reported to the IRS under their SSN.
If the amount is (or appears to be) more than $900 (no other income), they have a filing requirement. If they also have wages, as little as $300 can cause a filing requirement.
If the unearned income is more than $1800, the part that is over $1800 is taxed at their parent’s tax rate.