Many Dialects, Many Languages, One Cultural Lens: Evaluating Multilingual VLMs for Bengali Culture Understanding Across Historically Linked Languages and Regional Dialects. - Nurul Labib Sayeedi; Md. Faiyaz Abdullah Sayeedi; Shubhashis Roy Dipta; Rubaya Tabassum; Ariful Ekraj Hridoy; Mehraj Mahmood; Mahbub E. Sobhani; Md. Tarek Hasan; Swakkhar Shatabda (CoRR, 2026)