What language should we be speaking in the house, Tagalog or English?

Consider things like what language is mostly spoken in your house, or what language does the people around your kid use? Are his friends mostly Filipino or English-speaking? Does his school have an English Only Policy? Personally, I am teaching my child to speak our mother tongue. This is so he won't get confused and there wouldn't be a language barrier. I've heard that English-trained kids who are surrounded by Filipino-speaking people had a hard time socializing and expressing themselves. This can also be the same for vice versa.