Language A, Language B

Sometimes, in a bilingual or multilingual family, children speak to parents in Language A, and parents speak to their children in Language B, and they inter-comprehend. Such is the case in my immigrant family from the Philippines, who, in North America, have us children speak English to parents, and parents speak to us children in Tagalog. I am able to speak to other Filipinos in Tagalog. It has just become customary in my family to have the complex linguistic situation.