Not sure how spouse should file Trust fund

Any advice appreciated! Spouse grew up in a VERY toxic and abusive house, but a distant grandma put them as a beneficiary of her trust so, on SO's birthday at a certain age, they'd get the money.

SO's bday was in Nov, but due to marriage that year and name change, as well as PTSD-induced anxiety, SO didn't cash the check until this week. Soooo not sure how to file this. would it fall under 2024 or 2025?

Outside of this, our taxes are simple: - SO's part time job - my full time job - SO's student loans - my student loans - And of course, SO's weird trust situation

Should I just go to H&R? Would hate to waste the money if it's simple. Any help or guidance is greatly appreciated!