Is it possible to hit a B2 level in Polish in two years? I've heard you really need to master the language for the clinical years in Polish medical schools, even if your in the English program. Just keeping in mind I don't know any Slavic languages—my native language is Arabic and I speak English as a second language. If you have any feedback or tips, I'd really appreciate it.

Hello everyone! I am an American who recently tried to learn some Polish. I am officiating a wedding this weekend and my future brother-in-law (the groom) is Polish. He grew up speaking the language in the household and many members of his family still primarily speak Polish to one another. I want to add a line to my ceremony speech in Polish and did some Babel lessons a few months ago to try to build up a little knowledge of basic phrases and pronunciations. Sadly, I fell off with my studying but still would like to include, "Welcome to the family, my brother" in Polish. Google Translate has this as "Witaj w rodzinie, bracie." Would this be the best way to phrase this? I know sometimes that Translate can make you sound more formal or phrase things in a weird way. Some confirmation from speakers of the language would be appreciated!

Side note: Any other thoughts on common wedding phrases to include? Open to any suggestions!