"I inherited the IRA and my brother is in charge of it."
It seems that you are beneficiary of the trust, and the trust is the beneficiary of the IRA, so it's a bit inaccurate to say that you inherited the IRA.
It's not clear whether this is 2021 income or 2022 income. It depends on whether the trust uses a calendar year, or if it uses a fiscal year and the distribution of the RMD to the trust in 2021 occurred in the fiscal year ending in 2021 or in 2022. If it's 2021 income, the Schedule K-1 is well overdue to you. For example, if the trust uses a fiscal year ending on June 30, a distribution in 2021 after June 30 would be 2022 income to you. You need to sort this out with your brother.
