You’re an idiot for thinking a child cannot learn multiple language growing up. The best time to learn is from the beginning. Start them at young age and it generally stays with them as long as they use it (at home or in the community).
As a matter of fact your friend’s child is in the best situation to be multilingual. English will be naturally learned through community exposure (school, friends, watching tv, movies, etc..). And the child could easily learn Macedonian (Slavic) and Tagalog language at home. If they wanted him to learn a language that is neither the community language or their native home language then that’s when it gets way more difficult but people do it (with money to hire a tutor). Your friend’s kid first language will always be the community language (English). Everything else will be extra gravy.
You underestimate how well children can learn languages. My parents barely knew any french and my brother and I had no problem learning french and Cantonese. Then we learned English when we moved to Australia. I learned English (and was out of ESL classes) in less than a year.
