DH and i speak English at home, tv in English and some reading. DS' schooling is in Spanush and Catalan (Catalan is the school language, Spanish for rhe playground). He was born here (Spain) and has no real problems grasping any of the languages, although we try to read more local-language than English as at 6yo it is more important.
He spoke quite late as he had 3 languages bubbling around in there
but now can flit through the 3 without batting an eyelash
His cousin speaks not very much English, and with a local accent, as only her mum (DH's sister) speaks English to her. Sil isn't very pushed on getting cousin to answer her in English, Catalan reigns.
We often go to France for holidays and it is lovely hearing DS say bonjour and trying to chat with local kids.
I digress.... I also have friends who are he: Catalan-Dutch; she: Belgian French. Dad speaks Catalan, Spanish, Dutch, proficiency-level English. Mum speaks French, Catalan, Spanish, advanced-level English. Both dc speak Catalan, Spanish, French, English. Even though the first two are stronger, the other two are to a very high standard. It can get freaky 
At 16mo who knows what languages your child will be proficient in. It is quite a fun ride finding out.