Have my Mac Create a Wifi network

I don't believe that you can create a shared WiFi network when that interface is being used for the source network connection. I do believe that you could do what you intend if you have the ability to connect to the source network via Ethernet. Then you could use the WiFi interface to share to your family: Share the internet connection on Mac with other network users - Apple Support

there is only one set of radios in a Mac. you can't share it out as another network.

connect the base Mac with an Ethernet cable, and then you can share your INTERNET connection via Wi-Fi if that is your intent. The Mac will create a small Router in software to support this.

if you are doing this to limit internet time or simiiar reasons, Mac and iPhone already contain far better tools to do this.

Also, most Routers can drop the WiFI at a certain time of day. My sons lost Internet connection at 11:00 school nights, and if they needed more, they had to ask me for an extension. Our cell service is so bad, there was no competition from that. Today's phones have screen time limits that can be imposed in a similar way.

is your Router working off cable-TV cable? if so, the Router can be moved to any place on the cable-TV cable, it does not have to be in the cellar. That can make running ONE Ethernet cable MUCH simpler.

I recommend you NOT hold your breath, because to implement that feature, you would need an additional set of radios in each Mac.

Can readers help you think about this issue differently? What is it that you are trying to accomplish -- perhaps there is another way.

"Have my Mac Create a Wifi network: Good day to all, I would like to connect to a wifi network via a splash page and then create a wifi network from that network to share with my family. I don't see this option under sharing a network. Here is a screenshot of the options I have: It appears apple will only allow you to share a network if you are using cellular on an iPhone and on a Mac if you are hard-wired to an internet connection. Any solutions would be appreciated. Thanks, Aleks"

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Thank you for the screenshot.

Sharing a Network Connection:

A. Slash Page:

Slash Page is a third-party application. You should probably contact them for ideas on this. It seems configurations would take a big role. So, if you want to create a network, then create one through your router as a guest network. Link: Contact Us! - program

B. HTML:

You could create a web page using HTML. It would take some effort to learn, but as an example of how to see it in blank Courier New font, create this Bookmark: How to: View a Web Page's HTML Code in Plain Text (Courier New) - User Tip

I can't understand the use for this. If the Author is in the same room as their family then why would they not just connect directly to the same network as the Author with their devices? Why would they ever need to connect to a network via the Author's Mac? The Author has the password, presumably, so unless the network is set up on a Mac address basis that excludes the family I don't understand why there would be a need.

Understand - that explains it very well.