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thad23 wrote:

After doing the 18 Ios update, I'm getting my wife's text messages. We do share iTunes account but have not had this problem before. How do we fix that?

Not only will you get each others text messages, but your call logs are joined and you'll have access to each others voicemail. For more than a decade Apple has told us NOT to share the same Apple Account. If you don't want your data shared, you need to follow the good advice sberman provided.

Also, you might want to read this article, written by a well respected forum member (Lawrence Finch), which gives you detailed directions how to unshare an Apple Account --> How to “unshare” an Apple ID - Apple Community

Immediately stop sharing an Apple Account.

Make sure that each family member has a unique Apple Account - Apple Support

The person creating the new Apple Account should thoroughly cleans her/his device(s):

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

Then that person “moves in” using the new Account.

iTunes items may be eligible to be shared.

What is Family Sharing? - Apple Support