How are castelleno Catalan and Gallego related?

Castellano (Spanish), Catalan, and Gallego (Galician) are all Romance languages that evolved from Vulgar Latin, reflecting the historical and cultural influences in their respective regions of Spain. Castellano is predominantly spoken in central and northern Spain, Catalan is spoken in Catalonia and parts of Valencia and the Balearic Islands, while Gallego is primarily spoken in Galicia. Despite their differences, they share similarities in vocabulary, grammar, and syntax due to their common Latin roots. Additionally, they all play significant roles in the cultural identity of their respective regions.