Texting between family free (iPhone)?

So I read online that green texts means they cost money, and blue text don't. I noticed that between my friends I get blue texts to iPhones, and green to non-iPhones(usually they receive almost instantly). What really bugs me is that between my immediate family are all green texts. We all have iPhones and even on the same Wi-Fi house connection, texts take forever to reach and appear green. All our phones should and better be on the same account (sprint)

What's the issue?

Thy might not have their iMessage turned on, look under settings

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