Why is my Iphone not sending as Imessages and receiving iMessages from one person?

I'm texting my wife and we both have iPhone's and she is getting the messages as an iMessage but the ones I'm sending her on my end show up at green.
Sometime it will go as blue, get the little red exclamation point then send as regular SMS.
I'm texting someone else too and she has an iPhone, and she is getting mine as regular iMessages and mine are sending as regular iMessages.
Why aren't they sending to me wife as iMessages?

Because some people don't have iPhones and the ones tht don't have iPhones show up as green

Try closing up your imessage and restarting it and see if that works. Sometimes that does happen.

Go to Settings>Messages

Turn on iMessage.

Perhaps your wife, or you, lose internet connection regularly. Both of you will need to have an internet connection for the message to send through iMessage.

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