How do I stop sounding like a textbook when talking to my grandmother?

As a heritage learner, I have the vocabulary, but my family constantly giggles because I’m using standard, formal Yoruba instead of the natural, idiomatic way they speak at home in Lagos. I really want to bridge that gap and sound more authentic. Do you think using Chickytutor.com to roleplay informal family scenarios would help me practice these specific honorifics and colloquialisms?