Spanish and Italian same language, different dialects?

behold my multi lingual skills, they are in four languages, guess which is w hich.

Mis hamburguesas son muy sabrosas
miei hamburger sono molto saporiti
Meus hamburgers são muito deliciosos
Mes hamburgers sont très savoureux

I dont think dialect is the right word as that is just a variation on the same structure. I think of spanish and italian as two branches that extend of the same base. Italian and spanish both have fundemental differences on their pronounciation, but still share very similar root words and grammar. You aught to post pasages in spanish, italian and maybe romanian also to have the respective speakers see what they recognize it the other languages.

Many Italians are able to READ spanish and vice and versa.
However those are 2 different languages.
French and Romanian have common roots as well (Latin and Greek mainly).

I hear Romanian has kept some grammatical features in Latin that are missing in the other latin based languages.

No, very different, but same roots: latin. Btw, spanish is the language that is now the nearest to latin.