New immigrant tax filing requirements

[PB141]

Hello -

My father received his GC last year and stayed in the US for about 5 months in 2024. Rest of the year abroad where is the resident. He will be filing his taxes abroad for FY 2024. Is he required to file taxes in the US for the 5 months he stayed? Also, adjust the foreign income accordingly for the 5 months stay in the US? (he is retired and his income is pension and interest from deposits in the foreign country). He has no income or bank accounts in the US.

Please advice.

Thank you!