I'm curious as to why families don't speak their native language at home in Nigeria. I'm afraid I don't know a lot about your history, but I'm guessing British colonisation brought the English language in and I know many countries where they banned them from speaking their native language during the British empire. Did this happen in Nigeria too, is that why some parents no longer know their language well enough to teach their children, or was it more a way to try and fit in better with the colonisers? Do they only speak English in the schools?

I gather you have a variety of tribal languages across the country as well, so I guess English would be a language to allow communication to happen more easily across the country. Would this have had an impact too?