Hello darcille19! Thank you for participating in the Apple Support Communities.
We understand that you're getting unwanted spam SMS text messages, and these are also going to your children. We'd like to look into this with you to see how we can help.
Since "Report Junk" is missing from these messages, it sounds like you're receiving these messages by either SMS or MMS messages, which would be indicated by the green text bubble or send button in your Messages app when viewing the message. These types of messages can only be reported through contacting your carrier, as seen here: Block, filter, and report messages on iPhone
When these type of messages come through, it's important not to interact with the links, as they can sometimes be phishing attempts. And interacting with the link can trigger additional messages from the sender.
The following article can also be helpful in being aware of other methods phishing attempts and scammers can employ: Recognize and avoid phishing messages, phony support calls, and other scams
Make it a great day!