Hey ladyk16,
I am not quite certain what it is you are asking here. Are you trying to allow a family member to stream content such as movies or TV shows from your computer rather than having to download them from the iTunes Store using Family Sharing?
If that is what you are trying to do, streaming is not part of Family Sharing. It is, however, available as a part of Home Sharing, another feature of iTunes. See this article -
Learn more about Home Sharing - Apple Support
This article describes how to set up Home Sharing on your computer -
iTunes: Setting up Home Sharing on your computer - Apple Support
And this one describes how to set it up on an iOS device such as an iPhone -
iOS: Setting up Home Sharing on your iOS device - Apple Support
Thanks for using Apple Support Communities.
Be well,
Brett L